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After Rachel (Jennifer Aniston) left her fiancé, Barry (Mitchell Whitfield), at the altar in the pilot, her best friend Mindy (Jennifer Grey) then became engaged to Barry. Jennifer Aniston and Jennifer Grey played Jeanie Bueller. Grey played her in Ferris Bueller's Day Off (1986), and Aniston played her in Ferris Bueller (1990).
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.