Mickey Mouse and Ub Iwerks. Iwerks again served as the head animator, assisted by Johnny Cannon, Les Clark, Wilfred Jackson and Dick Lundy. This short was intended as a parody of Buster Keaton's "Steamboat Bill, Jr.", first released on May 12 of the same year. Although it was the third Mickey cartoon produced, it was the first to find a distributor, and thus is considered by The Disney Company as Mickey's debut. "Willie" featured changes to Mickey's appearance (in particular, simplifying his eyes to large dots) that established his look for later cartoons and in numerous Walt Disney films. The cartoon was
Steamboat Willie estimated budget of $4,986. There was initially some doubt among the animators that a sound cartoon would appear believable enough, so before a soundtrack was produced, Disney arranged for a screening of the film to a test audience with live sound to accompany it. This screening took place on July 29 with "Steamboat Willie" only partly finished. The audience sat in a room adjoining Walt's office. Roy placed the movie projector outdoors and the film was projected through a window so that the sound of the projector would not interfere with the live sound. Ub Iwerks set up a bedsheet