Audio problem: After Chico and Harpo first meet there's a man at the opera playing a drum. Not only is he out of sync with the sound we hear, but he is mimicking the blows.
Audio problem: When the Stooges are in drag and flirting with the police officer, Curly introduces Moe as his mother. However, when Curly says "And this is my mother", we see him finish the line but we don't hear it; we only hear the line finish when the camera closes up on Moe and Curly in the next shot.