At the time, Robin Williams was filming the 2002 film One Hour Photo, which is why his hair was blonde.
One of the few instances in the U.S. version where Colin hosted the party in "Party Quirks".
The initial promo had a line from Robin in "Scenes from a Hat" that wasn't used in the episode: "Yeah, you remember me."
Drew Carey worked With Robin Williams, in a Animated film from (2005), Robots.