Other mistake: A gangster pushes a dog into a well and the dog can be heard splashing around. The man's wife is furious and several people are unable to retrieve the dog. Superman tunnels into the ground and into the bottom of the well and emerges holding the dog. Both he and the dog are completely dry.
Continuity mistake: Ozzie goes to a boxing match. Stock footage shows two boxers fighting in a ring surrounded on all sides by ten rows of seats. Almost every seat is occupied. The close-ups show Ozzie sitting in the front row and there are only three rows of seats behind him.