Mr. Mouse Takes a Trip is unique among the classic Disney shorts in that film footage exists of the voice-over session, which included Walt Disney and Billy Bletcher.
The black-and-white film, which is about ten minutes in length, is the only known footage of Disney performing as Mickey Mouse and was included on the 2004 DVD release "Walt Disney Treasures: Mickey Mouse in Living Color, Volume Two" as an easter egg [REF].