- Harpo Does Something Funny: Billy Crystal and Robin Williams' scene was completely improvised, including Joey's line.
- Throw It In: Crystal and Williams' cameo is entirely this. The pair happened to be filming in a nearby studio and when the show's producers found out they decided to ask them to make an appearance.
- Uncredited Role: Former UFC fighter Tank Abbott as himself. Billy Crystal and Robin Williams as Tim and Tomas.
http://tvtropes.org/pmwiki/pmwiki.php/Trivia/FriendsS3E24TheOneWithTheUltimateFightingChampion
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