During production, the animators were given no instructions for coloring. Walt Disney instructed them to use any colors they wanted, which was a first.
The animators secretly modeled elements of the Sorcerer in "The Sorcerer's Apprentice" on their boss, Walt Disney. The raised eyebrow was regarded as a dead giveaway. They call the character Yen Sid, which is "Disney" spelled backwards.
The filming of the final "Ave Maria" sequence was plagued by mishaps. To achieve the effect of moving through the scene, several panes of painted glass were used. The whole setup was over 200 feet long and had to be redone three times. The first time the wrong lens was placed on the camera, and the subsequent film showed not only the artwork but the workers scurrying around it. The second time around an earthquake struck the studio, and the shot was once again scrapped. The next morning the shot was redone, the film was shipped to the lab, processed and couriered to the premiere in New York where it was spliced into the final print with only four hours to spare.
First appearance of Mickey Mouse in a Disney animated feature film.