Other mistake: When Daffy uses the elevator-like device to bring the second floor down to the first floor, there is a useless outside door on the second floor.
Design for Leaving (1954)
1 other mistake - chronological order
Directed by: Robert McKimson
Starring: Mel Blanc, Arthur Q. Bryan
Audio problem: When Elmer has his hat and coat taken off by the Hat and Coat Remover, he says "Hey! What is this?" but his mouth doesn't move.