First Walt Disney production fully animated by the Xerox process for transferring pencil drawings to cells. This was largely because it was considerably cheaper to test the process in a short film as opposed to a full length feature.
One of the drawing bits between Goliath and his mother was taken directly from Dumbo (1940) where she caressed him with her trunk.
Despite Raja having many roles in the film, he may seem like the main villain, but the short's real villain is the mouse.