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Most of the Friends have kissed each other, though one kiss is fictional (Monica and Joey in season seven, episode sixteen, The One with the Truth About London (2001)), and two of the kisses appear off-screen (Rachel and Monica kiss to retain their apartment, and Chandler kissed Ross at Joey's birthday party before making out with Joey's sister). Monica and Ross's on-screen kiss is a quick peck. They also kissed off camera, in a memory, in season ten, episode eleven, The One Where the Stripper Cries (2004). In season one, episode ten, The One with the Monkey (1994), at the New Year's Eve party, Joey kissed Chandler. Joey kisses Phoebe thinking it's Ursula. Phoebe kisses Rachel to find out "what the big deal is". Phoebe kisses Ross in a flashback episode. Phoebe and Monica kiss in The One With Ross's Wedding.
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.