Note both Mickey and Minnie are "pie eyed" -- a way of drawing the eyes that was only used for a short period due to the complexity it inadvertently created.
Mickey and Minnie "Yoo-Hoo" Pin
What I didn't realize until later was that the song from the film ("Minnie's Yoo-Hoo Song") became the theme for the Mickey Mouse Club.
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From “Mickey’s Follies” (1929). A Mickey and Minnie “Yoo-Hoo” pin from the film. The song, “Minnie’s Yoo-Hoo Song” became the theme for the Mickey Mouse Club. A Mickey Mouse film directed by Wilfred Jackson. “Yoo-Hoo” On the side/back: "Copyright 1930 Walter E Disney All rights reserved for Great Britain" A button of Mickey playing a piano and Minnie sitting on the piano. Enclosed in a package from The Walt Disney Company, 500 S. Buena Vista St. Postmark: Burbank, CA Sep 13 '88 [Item: 3-7/8" diameter] SeqID-0694 8/9/2005