Continuity mistake: In one of the early scenes where Baby, the pet leopard is introduced, you can tell that the scene was shot twice and overlapped. Baby's leash has an obvious gap in it, and the two halves move independently.
Continuity mistake: When Porky is lighting the candles on the cake at the beginning of the cartoon, the position of the candles change between shots.
Continuity mistake: When Daffy walks to the door of the film library, the door is green. When he opens the door in the next shot, the door is grey.
Continuity mistake: When the St Bernard dog is preparing the drink for the frozen bird, he puts a cocktail stick with a piece of orange and a cherry into the glass, but when we see the dog holding the glass in the next shot, the cocktail stick has disappeared.
Continuity mistake: A sow is nursing four little pigs. When the farmer brings food, she rises and walks away, leaving behind five little pigs.