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In Show No. 318 (2001) (broadcast October 10th, 2001), during the game Scenes from a Hat, the players were given the audience suggestion of "Difficult Questions for Mommy to Answer". Wayne Brady acted upon this by asking "Mommy, why is there no one like me on Friends (1994)?", to denote the absence of any relevant African American characters on the sitcom. As Whose Line was against Friends in the broadcast schedule for most of its run, the cast members would frequently take jabs at Friends. It is unsure if Friends' producers took the comment to heart, but in S09E20 of Friends (original broadcast: April 24, 2003), the first actually recurring African American character was introduced to the show. Charlie, a university professor played by Aisha Tyler, would be initially Joey's and later Ross' love interest. Any connection between both shows is unclear, but Tyler would later go on to host the revival of Whose Line Is It Anyway? (2013).
Drew Carey often jokingly introduced the Hoedown as "Our favorite game in the whole wide world." The cast members hated it with a passion. Ryan Stiles hated it so much that many of his songs insulted Carey, the Hoedown itself, or both.
The Whose Line crew was such a well-oiled machine that they could shoot 9 to 12 episodes on a single weekend. Shooting a whole season took only three or four weekends every year. The cast revealed it was one of the reasons they were so great together and had great relationships with each other, because they didn't have to spend that much time together.
When Robin Williams was a guest performer, his hair was blond. He was working on One Hour Photo (2002), and had dyed his hair for the role.