Continuity mistake: When Tweety hits Sylvester with a baseball bat while he is bouncing on the trampoline, you can see that Sylvester is positioned face down but when he lands on the trampoline in the next shot, he is now lying up.
Continuity mistake: When Sinatra comes down to Esther Williams to serenade her by the pool, she has just been swimming. When she meets up with him by the tree she is dry as a bone. Even her swimsuit is dry.