This episode came from the same taping as Show No. 407 (2001) and Show No. 419 (2001). During "Greatest Hits", Ryan pushes one arm forward while pulling the other back slightly. This is a reference to "Dubbing" in 419 where audience member Betty mimed stretching in a lazy manner.
Drew Carey: [after "Questionable Impressions"] Colin, Peter Graves, Humphrey Bogart, no wonder our 18-34 year old demographics are doing so well here on "Whose Line".