The episode where Joey is going to be the butt double for Al Pacino he gets in the shower supposedly naked. If you look on the wall of the shower you can clearly see the shadow of his boxer shorts (or possibly a swim suit).

Friends episode where Mr. Heckles dies Slip-Up: At the end of the episode, Chandler, adressing to joey, calls him Matt. He says something like "see you,Matt" Matt Le Blanc is the actor who plays Joey on the show.

When Phoebe has a flashback concerning herself and Ross, they are kissing and Ross throws her onto the table. He then says 'The stupid balls got in the way' when he tries to kiss her again. This line was not meant to be in the script - David Schwimmer said it when they were filming, but they
decided it was funny, and left it in!

In the episode where Monica gets back together with Richard for a "friends relationship" and Pheobe dates the sporty guy who "pokes out" there are two slip ups. The first is when Rachel goes to borrow some ice from Joey. She twists the tray to get the ice free to put in her blender, but then when she leaves, the blender is empty. What happened to the ice?? The next is when Monica is waiting in Richards room. There are candles, wine and roses. When she realizes that he is home with another woman she blows out the candles and tries to hide. One of the candles on the dresser doesn't go out. It is then still lit, but then it is out. Hmmmm...

Watch series 6 of friends- the one where Phoebe is left to look after the babies, just before the camera cuts to the baby in the drawer, look on the right of the screen. What looks like a ghost can be seen!!!

In the episode where Ross dates Amanda and Monica gets to cater a funeral notice when Rachel talks to Joey, she calls him Lee as in Matt Le Blanc

TOW where Rachel buys a really expensive cat (the hairless one). She walks into Joey and Chandler's apartment and she is holding the cat on a pillow. She is over by the room separater and her arm is lowered near the cat. Next shot it's up. Next shot it's down again.

In the episode that Bruce Willis takes Rachel to the cabin and they bump into Ross & Young Daughter of Bruce Willis, watch Rachel holding her glass. First it's in her left hand, then her right, then her left, then her right again. Minor, true, but nonetheless a slipup.

TOW Rachel gets Monica to cook a dinner for her and Joshua. They are eating and Joshua gets paranoid over the duck and goose being there. Joshua decides to take her to his home. Rachel went to get into something more comfortable and she comes out in a nightie. She positions herself on the couch with a pillow on her lap. Her arm is first by her face. Next shot it's on the pillow. Next shot it's back up by her face again.

TOW Mr. Heckles dies and Chandler thinks he's going to die alone. Rachel and Monica are in their apartment when Chandler comes in talking about dying alone. They are all standing in the living room and you see Rachel with her hand by her face. The next shot it's down by her side. The next shot it's back up by her face. Wow!

During the episode when Chandler & Monica get engaged, Rachel is in the coffeeshop talking to Phoebe about whether they're jealous of the engagement. Rachel's arm is on the arm of the couch, then off. Then on, then off. Then on, then off. This happens during cuts of course -- she's not just extraordinarily quick or anything.

In the episode where Joey is looking for the 'hot girl' who lives in Ross' apartment block. He knocks on Ross' door, when he does this,he has a purple shirt on, but when Ross answers the door Joeys shirt is black.Later that day when he is sitting in the girls apartment his shirt is purple again!!!! How strange!!!!

This involves the pilot episode & the 2nd ep. In the pilot ep we see Rachel come in from running out on her wedding etc. but not once, throughout, do we see a ring on her finger (engagement...per se) however, in the 2nd ep Rachel is upset over losing the ring & she "had it on" & ends up losing it in the lasagna. Ok. Where was the ring in the pilot episode???

In the beggining of the episode, Ross and Joey are playing with the ball in the girls apartment. One minute the ball is blue, the next it is pink.Whats going on here then???.......How strange.

When Monica first enters the church as a bridesmaid her shoes are spangly and shiny. Later on in the episode they are different and a slightly different colour. This is quite hard to spot so you have to watch very carefully.

episode 4 series 4. Slip-Up: When the phone ringings, Monica picks it up, but it carries on ringing once she had picked it up!!!! Doh!!!!

In the episode where Joey buys the encyclopedia from Penn, the $50 bill never actually changes hands. Joey is holding it, then in the next cut, Penn is putting it in his pocket. Quite a magician indeed!

episode 1series3 Slip-Up: When Joey and Rachel are looking out of the window at the fat ugly guy they wave at him and he waves back. But when they stop waving and say that he has gone it goes to a clip of him waving still. A bit of bad continuity editing there!!!

In TOW the wedding dresses, Monica goes to pick up Emily's wedding dress and ends up trying it on. The dress Monica wears is completely different from the one Emily wears on the season finale. If something happened in an episode that made Emily not be able to wear the dress Monica did, I didn't remember it.

In the pilot episode,Rachel doesn't know Ross's friend Chandler.However,in later episodes we see that Ross brought Chandler for thanksgiving dinner at least twice when Rachel was there.

Tow Ross´s leather pants. Slip-Up: When Rachel and Joey compare their secrets to each other, Rachel gets up to leave the girls apartment you can see the camera reflection in the window.

On (TOW)The Flashback, the show takes place in the year 1996, and when they have the flashback and then it takes place 3 years earlier (1993) well remember that Joey barely meets Monica, Ross, Phoebe, and Chandler. Well if you have ever seen (TOW) The Thanksgiving Flashbacks, the flashback with Joey getting his head stuck in the Turkey, that thanksgiving took place in 1992, and on that flashback it seems Joey already knew the group.

During Joey's "Big Break" he gets a job playing Dr. Drake Remore' on Days of Our Lives. Now anybody who ever watches the show knows that his character doesn't exist (which is no big deal). However, even more importantly, Days is filmed in Burbank, California, and Joey (obviously) lives in New York.

Watch the episode where Joey and Chandler take Ross to the Rangers game to get his mind off his ex-wife. When the slapshot comes flying into the crowd, it hits ross in the nose. This always stops play (and the clock.) But when they are shown on the JumboTron, the clock is still running!

In the last episode of the third season Ross is trying to choose which room to go to. Finally he walks into into one room, says hi and closes the door behind him. In the first episode of the fourth season he walks into the room, says hi, and the door remains open until his girlfriend closes it when she walks out.

In the 4th series, Joey and Chandler talk about how good the british version of Die Hard would be, Die Hard stars Bruce Willis. In series 6, Bruce Willis is Ross' girlfriends dad. Joey and Chandler don't recognize him? And in the one with the princess leia fantasy, Ross and Chandler talk about when having sex they picture people such as "the girl with the belly button ring " and Elle Macphearson. In Series 6, She becomes Janine, Joeys room mate. She also is not recognized.

In the episode "When Monica and Richard are just friends", when Monica goes into her room (after Rachel says her day could still pick up), if you look out the door when she goes in you can clearly see the set outside. It is all wood and cardboard.

In the episode where Monica and Chandler go on a dirty weekend away (series 5). When they are home Monica calls chandler into the hallway. As chandler leaves his appartement he is empty handed, but as he walks out the door into the hallway he throws an apple into the air. I watched it over and over so there is no way he could have picked it up anywhere.

The first time Phoebe remembers a Thanksgiving in a past life, her arm falls off before the explosion actually happens. You can also see the wire used to pull the arm off.

In the episode where the group realizes that Monica's boyfriend Fun Bobby has a drinking problem, watch the scene where they find that out. Monica is leaning on the couch on the right side of the kitchen table then Phoebe comes to her and says something to her. Then in the next shot Phoebe is suddenly on the left side of the table.

In the episode where Joey is Al Pacino's butt double, there's a ceiling light hanging over the coffee table in the girls' apartment when they're making fun of Joey. But at the end of the episode, when he's explaining why they fired him, the light is gone

I'm not sure what episode it was, but in the 1999 season, Ross had broken something and glued it back together. He set the bottle down when Rachael came in. They were talking and, as the shots went back and forth between them, you can see the glue bottle in the background go from standing up to laying down and back up again.

I noticed this a week ago, so don't know if it's always been there or not, but if you look on Joey's fridge, on top, you will see that he has a jar of Quik chocolate powder. It is clearly labeled Quik. However, for a year or two now, Quik has changed it's name to NesQuik. Someone should get them some food that hasn't expired over the last year!

In a Thanksgiving episode from an earlier season, Chandler says that when his parents told him they were separating, he had a mouth full of pumpkin pie. Later in the Thanksgiving episode with all the flashbacks, we see his parents telling him, but his mouth is empty.

On the episode, tow. Chandler crosses the line, when Ross is talking to Phoebe about "the sound", Phoebe is holding her red guitar in her lap. At the moment she says "Play that Funky Music, White Boy" the guitar disappears. And in the shot Ross gets up to go get his keyboards, the guitar appears again in Phoebe's lap.

In the episode where Phoebe has the triplets, the doctor turns on the TV and plays "Happy Days" just before delivery. You hear the theme song... "Sunday, Monday, Happy Days..." Then he says that the episode is the one where The Fonz plays the bongo. The problem is that episode of "Happy Days" was an earlier one in which the theme song was "Rock Around the Clock".

At the end of the first ever episode of "Friends" (the episode where Monica sleeps with Paul and Rachel leaves Barry at the alter, in case you forgot), Ross and Rachel are sitting in Monica's apartment. They split and Oreo cookie. Rachel is playing with her half (she never actually eats it) and in one shot she breaks it in half. In the next shot it's back into one piece and she puts it back on the plate in ONE piece. What is she, a magician? ;)

This is in the episod where Joey and Chandler invent the game fireball, and Ross tries to help Joey write a play. Joey and Chandler are talking about their security deposit, and Joey says "I think we said good-bye to that when we invented Hammerdarts. Chandler says "Do you even remember which part of the wall is not spackled?" and Joey says " yeah, right here, and punches a hole in the wall". A few minutes later, they show the wall again, and the hole is not there anymore.

In the series episodes, the ones where Monica's character is identified as Courtney Cox Arquette, instead of just Courtney Cox, the very first shot during the theme song shows a view of the city. If you look at the upper-right hand part of the screen, you can obviously see that it is just a picture being held up on a black backround. Thats a big mistake considering that shot is in every show

In the episode of Friends where a person with a telescope looks into their apartment, Monica and Rachel can both see her straight across the window from where they can see the 'ugly naked guy.' Then, the next day, Joey and Chandler claim that they can see the spy looking in their apartment too. Not possible! The apartment building that Monica and Joey live in does not support this. If Joey and Chandler live across the hall from Monica and Rachel, and Monica and Rachel can see the spy directly across from their big window, then it is impossible for the spy to see both apartments. And Joey claims that he can't cook naked anymore, well there is no window that you can look into to see Joey and Chandler's kitchen.

Where Phoebe is talking to Emily's step-mom, she's making a sandwich. The camera cuts from Phoebe and Emily's step-mom. Phoebe puts mayonnaiseon the sandwich. After Emily's step-mom hangs up on Phoebe, and the camera goes back to Phoebe, the mayonnaise is gone.

In the episode where they are all about to leave to go on a trip because Phoebe was jealous at missing the London trip due to being pregnant (I forget where they are going - Atlantic City, maybe?). Anyway, just as they leave, Phoebe's waters break and the 3 boys all jump back in horror. When you next see Phoebe, there is no sign of wetness on her or the floor. Her dress and/or the floor would be pretty wet, especially since it seemed to be quite bad given the boys reaction.

In TWO where Carol gets married to Susan, Rachel is nervous about her mother coming to visit and accidentally brings her friends dirty, half-drank cups of coffee and Chandler says "I ordered the coffee with a cigarette floating in it" or something like that. In TOW Chandler takes up smoking, Gunther tells him he can't light up his cigarette in the coffee house. If you can't smoke in there, how did the cigarette butt get into the coffee cup?

In the scene where Rachel is coming in to get her passport in her and Monica's apartment, Phoebe is on the floor by the coffee table trying to call London to warn them that Rachel is coming. As Rachel is running in Phoebe says "oh thank god there you are" and puts the cord-less phone on the table but a quick second later, the phone is in Phoebe's hands and not on the table anymore.

After both Monica and Rachel lose in the lightning round they are to give up their apartment to both Joey and Chandler. Later on when the guys are moving their stuff into Monica and Rachel's apartment, Rachel comes out whining that both she and Monica shouldn't have to move.

Then Monica comes in saying "Look Rach, we have to move. I mean if WE had lost, we would’ve made them get rid of the birds. Right?" The problem is the girls did lose the game and instead Monica should of said "if THEY had lost". Too bad the editors didn't catch this

In the episode where Phoebe's love David comes back, Joey hugs Phoebe's after David leaves. If you look at his collar during this whole scene, it goes up and down.

In the episode when Chandler gets handcuffed by Joanna, the scene when Joanna walks out of Chandler and Joey's shower, she goes into Chandler's room and shuts the door. Rachel, Joey and Chandler are talking and as the camera cuts between them you can see a closed door behind Chandler. In one cut you can see that the door is open but Joanna has not come out of the room because they are still talking about her

In the sixth series where Chandler accidently picks up the telephone at Joey's house, it is new timings for auditions for the sitcom Mac and c.h.e.e.s.e., behind Chandler on their notice board on their door, there is a drawing of an alien of some-sort, yet when Chandler goes to write the message for Joey, it mysteriously disappears!

At the bit before the title music Phoebe and Rachel are recording a message for their answer machine. When the recording goes wrong they don't press stop on the answer machine and it would keep recording their conversation.

This is the episode where Phoebe meets her mom, Teri Garr. When they enter the beach house near Phoebe's the sand is wet because it washed in from the beach. They look away for 1 second and when they look back, it's dry.

When Joey goes to meet up with Susan Sarandon's character on the set of 'Days of Our Lives' for the first time in the episode the camera keeps switching back and forth between the two. During their conversation in between camera shots, we see that Susan's character has a cigarette in her right hand then in the next camera shot she has a glass of wine in her hand, then the camera shot switches again and the cigarette is back in her hand all in 3 seconds. Oops!

In the episode where Rachel's father visits, Ross and him both make fun of Rachel for going to the chiropractor Dr. Bobby. Rachel claims that she has bad alignment and that her right leg is two and a half inches shorter than her left leg. Then she stands still and leans to one side. However, instead of leaning the correct way, to her right, she leans to her left.

In the birthday episode in series 7, The friends give Rachel a surprise party for her 30th birthday and Joey says several times that they are all 30 (Except for Phoebe who finds out that she's actually 31) but we know from several flashback episodes (the Thanksgiving episode where Monica cuts off Chandler's toe and the episode where Ross almost takes Rachel to the prom) that Ross and Chandler were in college together while Rachel and Monica were still in high school. Plus with Ross and Monica being brother and sister, their mom would have had to have gotten pregnant with Monica really soon after Ross was born since we can see from the birthday flashbacks that they aren't twins.

In TOW Phoebe finds out about Monica and Chandler is dating and flirts with Chandler.... In the scene where Monica and Chandler are saying stuff like "Trust me. Pheeb's is gonna give in way before you do.".... well, Monica sprays breath freshener into Chandler's mouth. If you look closely... she does not spray it in his mouth, she has the head of it turned so that it sprays off to the side. Hmm...
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These Two Are From Sarah Eurich, Cheers Sarah
From the one where Rachel can't find her ring that she has to return to Barry. When Rachel announces that she can't find it, Monica tells her that they will all help to look for it. At that moment Chandler is either sitting on a chair, or standing by it in the living area. Suddenly, as the camera angle changes, Chandler is looking for the ring over by the fridge......mmmmmmmmm. How did he get there so fast? its impossible, no matter how many times I watch it!! Fast mover hey!?!?

Its from the one where Monica's going out with Alan, from series 1. Chandler is outside on the balcony having a cigarette. When he is told that Alan has arrived, he somehow gets from outside to the kitchen table it vertually 1 camera move. If you look at the window to the balcony on other episodes, its pretty high up. how did he do it. Wow, his speed impresses me.!!
This One Was Sent To Me By Jacquie Principi. Thanx
in TOW two parts chandler is talking to Joey and Chandler  is holding a
water bottle and first the cap is on and he takes it off then its on
again....the scene is to fast for him to put it on that quick
Jenny Wooster Spotted This One The Other Week
When Ross moves into Ugly Naked Guy's apartment and keeps doing little mime acts to impress Rachel and Monica, they get so fed up with it that they ask chandler and joey to borrow their life-size cardboard cut outs of pamela anderson and yasmine bleath. They stick on photos of themselves of their heads on the bodies but these heads are from the official pictures that are always used in books or website about Courtney and Jennifer.
The One With The Slip Ups