- As Claudette Leaves the Cabin, her socks are pulled to her Calves. But when she enters the barn with Barry, the top of her socks are folded down so they are just above her ankles.
- When they are playing the Monopoly game the dice shows a 1 and 2, but when they say the roll aloud they say double sixes.
- Annie says she will be cooking for 50 kids and ten staff, later in the movie and says she hates when people call children "kids".
- In the beginning when Claudette and the other councelors are singing, the music continues to play after she had stoped playing the guitar. Also in that scene the far away shots show her legs spread apart and the close up shots show her legs crossed.
- After Alice and the other counselors are done getting the stump out of the ground by the lake, Alice puts down the bucket she is carring down on the ground and in the nexted shot she puts the bucket down again.
- When Jack gets the spear through his neck, the line between Jack's head and the fake neck is visible.
- When Alice us scared by Crazy Ralph in the pantry and screams, Marcie and Ned can be seen to enter the room twice.
- When Ned runs to Alice to help her he is shown eating a hamburger, but the hamburgers will not be cooked until the nexted scene.
- When Alice is alone making coffee, on the table behind her there is a blender and a basket of eggs. When Alice comes back from finding Bill's dead body the basket and the blender have switched spots.
- After Alice hits Mrs. Voorhees in the head with the frying pan, she is laying on the ground and her arm positions seem to change when she is laying down.
- Alice hits Mrs. Voorhees on the left side of her neck, but the right side of her neck is the side that opens up.
- The Police Officer leaves his car in the road to go chase after Jason through the woods. The Police car disappears when Ginny and Paul come back later that night.
- When Terri is shown going back to the cabin to get a knife, her pants are undone at the waist, When she reaches the cabin they are tied up with a bow, then when she walks back to Scott, they are untied again.
- When Jason cuts Scott's throat he cuts it straight across, yet the wound is diagonal.
- When Paul and Ginny return from the bar, Paul turns off the car and the windsheild wipers are pointing straight up, Later when Ginny returns to the car, they are down.
- When Edna is done yelling at Harold she closes the window, getting the curtain stuck in it. In the nexted shot, the curtain is no longer stuck but is hanging inside the window
- When Harold is stabbed with the meat cleaver by Jason, the blood goes all the way down to his stomach, but when he falls on the floor, there is only blood around the cleaver.
- Jason was stabbed deeply with the machete at the end of Part 2 but in this movie he seems to have no wound on his shoulder.
- When Chris is having a vision of being attacked by Jason, he is wearing the same clothes he stole from the clothesline at the beginning of the film, but the attack happened several years ago.
- When Loco sees Fox with the pitchfork in her neck, there is somekind of device wrapped around her leg that is supporting her.
- Jason looks totaly different in Part 3 then in Part 2, but Part 3 is suppose to take place the day after part 2.
- When Chris looks at the ax in the burn it is resting against a metal object, but in the shot where she picks it up, it is show lying on the ground.
- When Chris is being choked by Jason in the Van, the window is rolled all the way down. Chris turns it on full-turn, and in the nexted shot it is rolled all the way up.
- Jason approaches Loco with a 5 pronged pitchfork, but when he is stabbed it shows a 4 pronger pitchfork.
- When Debbie is in the shower she is shown with a necklace on, but when she gets out the necklace is gone.
- When the paramedics are bringing in Jason on the streacher, his feet are not facing them, but when they come into the room with Axel, Jason has switched postions.
- When Jason crushed Doug's head in the shower, his hockey mask has two red marks near the nose. But later, the red marks are gone.
- When Sara goes into the second floor bathroom to dry her hair, there is a bench in the hall. Later, when Jason chases Trish upstairs, the bench has moved across the hall.
- Pamela Voorhess tombstone reads "1930-1979." But Part 1 took place on June 13th, and June 13th, 1979 was a Wednesday, not a Friday.
- In Part 3, Jason's fingernails were very neat and trimmed, but in Part 4 Which is the day right after part 3 ended, they were long and black.
- When Jimbo is killed with the meat cleaver, you can see that the cleaver has the front cut out of it to fit on Jimbo's Head.
- When Jason throws Tina out the window, the top view shows that the car was already dented and the glass was already shattered before she lands.
- When Jason is trying to break into Tommy's room, and trying to move the bookcase, he knocks several items off its shelves, including a yellow and white stuffed animal, which later reappears on the shelf in the nexted shot.
- Trish swings the machete overhanded, but in the nexted shot she knocks Jason's mask off underhanded.
- In Part 3 Jason was stabbed in the leg and his hand, but in Part 4 wich takes place the day after Part 3, there is no blood stain and no cut in his pants or his leg, and no wound on his hand.
- When Lanna is putting on her Lipstick she smears it on her upper Lip, but when she turns at the cat's noise, it is pressed and perfect looking.
- When Pam, Tommy, and Reggie are going to see Demon, they pass the same rocks several times.
- When Pam is running through the woods her sweater she is wearing disappears then reappears.
- When Violet is stabbed with the machete, the machete blade has no blood on it when it is pulled out. Same thing when Ethel is stabbed with the cleaver, the blade is totaly clean.
- When Reggie hits Roy with the Tractor, the wound on his chest only appears after he has hit the ground.
- When Tommy goes to slice Roy's arm, you can see he is not really holding the machete in his hand.
- Jason's corpse suddenly turns into a completely clean skeleton immediately before it is stuck by lightning
- Jason kills Burt and takes his belt, but the belt appears around Jason's waist before he has the chance to put it on.
- All the motor home lights are on when Cort is driving, but after Jason Kills them both, just before the motor home crashes, it is completely dark inside.
- Officer Pappas reports Megan's license plate number even though she is driving backwards and there is no license plate on the front.
- There is a camera visible in the bottom left of the window when Sissy pours the soda out.
- In the coffin, a maggot falls straight down off Jason, even though he is supposedly lying down.
- After the triple decapition of the three paintball players, you can see the mat on the ground on which their corpses fall.
- Jason's machete disappears from his hand as he walks after steven through the woods.
- In alot of different shots of Crystal Lake from the shore the water is always murky and brown, yet underwater, it is clear, well-lit, and blue.
- When Michael's girlfriend is waiting for him to return from the bathroom, the cooler in her hands disappears in the reverse shot of Jason coming up behind her.
- The tent that Judy and her boyfriend are camping in changes size between shots.
- After Maddy puts her makeup on, she exits through the same door, which is on the upstairs floor, but in the next shot, she steps outside.
- The Monitor and VCR on Dr. Crews' desk disappear as Tina looks at the Picture of her father, and there is a model train on the desk in some scenes and not otheres.
- The suit Jason is wearing is not the same suit he wore in Part 6.
- You can see the cameraman's shadow on the wall just before Robin knocks on a door and says "Maddy".
- When Sean gives Rennie the bracelet, in the first shot he reaches into his pocket, yet in the nexted shot she is already holding it.
- When Tamara and Eva are using drugs, their hair changes from shot to shot.
- Rennie stabs Jason in his left eye, yet his eye is untouched when he loses his mask at the end of the film, and his eye was rotted out in Part 7.
- When Rennie speeds towards Jason, everyone else is in the back seat. Yet after they crash, Sean emerges from the front door.
- The captain of the ship gets his throat slashed, yet no blood gushes out immediately.
- Jason gets his mask back in Part 8 but it was destroyed in Part 7.
- In Part 7, Jason's suit was shredded so that you could see his spine and kneecaps. In Part 8 he has gained a new suit when he was underwater for awhile.
- In the Close up of Jason grabbing the boats railing, you can see Kane Hodders pinky finger sticking out of the glove.
- When Tamara comes out of the shower, she's completely dry.
- When Agent Marcus is running through the woods with Jason in pursuit, her footwear changes between none at all, boots, and skin colored shoes.
- When we first see Jessica while she is talking to her mom on the phone, her baby has no hair. Then when she vists her mothers house alittle later the baby has a full head of hair and is bigger.
- When Agent Marcus is replacing the light bulb she places the old one on the ladder, then she folds up the ladder and it does fall.
- After Jason kills Diana, Steven has hardly any blood on himself when he is arrested, but at the Police Station, his jeans are covered in Blood.
- When Steven and Randy fight on the roadside, steven has his gun in the back of his pants, but then draws it from the front of his pants.
- Though set in Ohio, all the cars have Connecticut license plates on them.
- The Mailbox of the Voorhees house it is missing a O and is spelled Vorhees.
- The robot first says the Unit manufactured in 2010, Later on the same robot says its been down and frozen for 4.55 centuries, when it is 2455, this means the machine was manufactured for 4.45 centuries and not 4.55.
