Continuity mistake: When Opie surprises Andy by telling him that he wants to take piano lessons with Clara, he heads to the piano to play what he already knows, and when Opie plays Chopsticks on the piano he's wearing a different shirt.
Continuity mistake: Wilma opens the bedroom door to find Fred covered in flour, but in the next shot the bedroom door has vanished while Fred stands in the doorway.
Continuity mistake: "Rusty Romeos," a 1957 short co-starring Joe Besser, is a remake of "Corny Casanovas," a 1952 short co-starring Shemp Howard. In a scene using stock footage from the earlier film, Moe and Larry are fighting, and a framed photo of Shemp is on a small table next to the couch. In the following scene, using new footage, the photo is of Joe. (00:15:10)