Continuity mistake: When Tweety is running away from Sylvester, he hides in a tube of "Badminton Birds." When Sylvester comes around the corner, you can see there is a racquet next to the tube, but when we see Tweety coming out of the tube in the next shot, the racquet has disappeared.
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.