Lucy's whole name is Lucille Esmerelda McGillicuddy

She was born on August 6, 1921

Her hair is mousy brown naturally, but she dyes it every two weeks; her eyes are blue.

Lucy doesn't like mustaches - or maybe she just dislikes them on Ricky.

Some of Lucy's campaign posters for President of the Wednesday Afternoon Fine Arts League, which usually met on Tuesday but sometimes on Thursdays or Fridays:

Lucy had six votes, as did Ethel, and only needed Ruth Knickerbocker's vote to break the tie and become president.

Dr. Peterson was her doctor, and he once treated her for a cat bite by Fred Bigelow's cat.

Lucy played the mean old witch in the school play, The Enchanted Forest.

Lucy likes it colder at night and wants the window open to let the air in. This was the same situation in real life for Lucille Ball.

Helen Erickson babysat her.

Lucy and Ethel bought 500 eggs to put in the henhouse.

Lucy flunked Spanish in high school.

When Lucy wrote her novel - Real Gone With the Wind - she received a $100 advance from Dorrance & Company.

Lucy and Ricky got married in 1940. So did Lucille Ball and Desi Arnaz.

Lucy gets her hair dyed every two weeks.

The only member of Ricky's family that Lucy had met before the episode "The Ricardos Go to Cuba" was Ricky's mother.

NitAlert
Lucy said her grandmother was Swedish in "Pioneer Women", but later, when the gang is in Europe, she wants to find her ancestors in Scotland.

When Ricky can't remember their anniversary in Hollywood, it turns out to be the 7th; but when Ricky buys her pearls in another episode, it's the 19th.

Lucy got pearls as a wedding present from Ricky, but in the Lucy-Desi Comedy Hour episode where they go to Japan, the whole episode is centered upon Lucy wanting pearls.