Continuity mistake: When Daffy tells his wife "If you'll just let me explain, " you can see the back of his tail has no feathers on it. But when his wife tells him to pick up his face and sit on the nest, his tail is covered with feathers.
Continuity mistake: When Sam is going to the widow's house, he is carrying a box of chocolates and a bunch of flowers, but when he arrives at the door, the chocolates have disappeared and the flowers are completely different.
Continuity mistake: When Sylvester Junior is turning the wheel to pump oxygen into his father's diving suit, he spots a worm and starts following it, walking away from the pump. But when Sylvester bangs on the tank glass telling him to start pumping, we cut back to Sylvester Junior and he is back near the pump again.