蒸気船ウィリー
Mickey's wallet contains a photo of him piloting the boat from "Steamboat Willie" (1928). Mickey also whistles music from "Steamboat Willie" before he goes into the laboratory. The wallet also features a library card from the fictional 'Guillard County Library', a reference to actor/director/producer/writer Stuart Gillard. The theme song from "Steamboat Willie" was also used for the closing credits.