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Out of the six friends, Chandler (Matthew Perry) is the only one to not have any siblings. Rachel (Jennifer Aniston) has two sisters, Monica (Courteney Cox) and Ross (David Schwimmer) are brother and sister, Phoebe (Lisa Kudrow) has a twin sister and a half-brother, and Joey (Matt LeBlanc) has seven sisters.
Joey was originally written as a jerk. When Matt LeBlanc questioned why the others would be friends with him, the character was changed.
When Matt LeBlanc auditioned for the role of Joey, he had eleven dollars to his name. When the cast got their first paychecks, the first thing that LeBlanc bought was a hot dinner. Courteney Cox bought a car.
When Courteney Cox dressed as fat Monica for the first time, Matthew Perry walked right past her without recognizing her.
Courteney Cox was originally supposed to play Rachel. In Friends: The Reunion (2021), she explained that she asked to play Monica instead, since she related to her more.
Lisa Kudrow and her best friend wrote "Smelly Cat" one night when they were drunk, and it eventually got written into the show.