Continuity mistake: When Daffy is in the pond during the filming of "The Duck", you can see behind him there is a log. But when we see the hunters blasting him, two large rocks have appeared from nowhere.
Continuity mistake: When Elmer is shooting at Bugs, Bugs is holding a carrot in his right hand. But when we see Bugs running, he is no longer holding the carrot.
Continuity mistake: When Daffy (dressed as Bugs) is fishing at the pier, there is a can beside him that keeps disappearing and re-appearing between shots.