Audio problem: When Elmer grabs his gun and says "Ooh, I should have known better!" his mouth doesn't move.
Wise Quackers (1949)
1 audio problem - chronological order
Continuity mistake: Before Elmer's two dogs shake hands on agreeing to catch Daffy, one of them draws a diagram which is a dotted line and a circle with a cross in it. After the two dogs run into a tree, they go back to their meeting point and this time the diagram is completely different to the one drawn before.