The "goofoid" figures were an interesting introduction in these early films. Both pigs and goofoid characters showed up as background characters.
I liked this image for its rendering of movement as the mail bags were removed from the airplane.
Pigs & "Goofoid" Characters in Hanger
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From “Mail Pilot” (1933). Pencil layout drawing of activity just outside one of the hangers. Pigs and Goofoid figures working on planes and loading other planes. Note: Signs say “Mail.” [Image: 12"W x 8-5/8"H; 2-hole] Acquired 1993. SeqID-0070 7/15/2005