Continuity mistake: When Jerry slams the door on the dollhouse after Tom attempted to catch him after his dress slips off, the blind in the top window is pulled right up but in the next shot it's now pulled down halfway.
Continuity mistake: During the opening of "This Is the Army" [the stage musical], there is a large choir of men singing the opening number, "Some Dough For The Army Relief": from about the second row back, the men's mouths are moving appropriately for the lyrics they're singing, but much of the front row is singing with these obnoxious cheesy grins, not even bothering with more than the most feeble attempt at proper mouth movement. [This is painfully evident during the line "let him do what we had to do."]. (00:48:50)
Continuity mistake: When Mr. Dingle walks past all the other prospect tenants for the apartment, the young fella at the top of the stairs on the right is holding his newspaper in 3 different ways in separate consecutive shots. Not just that: the No Vacancy sign Dingle hung on the letterbox is tilted differently in separate shots. (00:04:30)
Continuity mistake: When the convict sees Droopy on the banister, he slides back up and goes into his apartment. When he arrives at the apartment, there is initially nothing on the door but a few seconds later a door handle and lock appear.
Continuity mistake: When Mr Pig is speaking to his baby son in the cot, the headboard of the cot is initially coloured white, but in the next shot it is now grey.
Continuity mistake: When the mice are serving the cat, there is a mouse who is taking the cat's order and he drops his notepad on the floor when he says "Mouse?" and runs off. But when we see a full view of the cat and the mice in the next shot, the notepad is nowhere to be seen.
Continuity mistake: When Daffy gives Porky his card, Porky holds it with both hands but a close-up of the card shows him holding it with only one hand.
Continuity mistake: When Jerry launches his egg carton, there are initially three light bulbs in the back, but when he releases the bulbs, there are now four.