In Donald Duck's scene with Walt Disney, his hat is blue with black trim. Yet in the next scene, which is the cartoon "Donald's Cousin Gus", his hat is white with blue trim.
Walt Disney: Donald, the people are waiting.
Donald Duck: Bah! Let 'em wait!
This is the second episode in the "Art of Animation" trilogy. It features the now famous "Soup Sequence" that was cut out of Snow White and the Seven Dwarfs. New animation featuring Mickey Mouse was also filmed for this show. Produced in color, it's one of the few shows that carried over in reruns to The Wonderful World of Color.
This episode is on the Region 1 Walt Disney Treasures DVD set "Behind the Scenes at the Walt Disney Studios."