Continuity mistake: When Piggy is seated at the dinner table, there is a bowl of fruit with a yellow lid next to it, and Piggy has in front of him a plate with a spoon on one side and a knife and fork on the other. After Piggy's mother stops him from taking some fruit, we cut back to Piggy, and the bowl of fruit and yellow lid have disappeared, and he only now has a spoon by the plate.
Continuity mistake: When Egghead Jr. shows Foghorn Leghorn the formula for how he managed to dig him out of the ground, you can see that Egghead has nothing next to him, but in the next shot a spade has suddenly appeared.
Continuity mistake: When Porky tells Daffy to arrest Nasty Canasta, you can see the window next the door has four panes of glass, but when Daffy challenges Canasta to a fight, the number of panes has increased.
Audio problem: When Elmer has his hat and coat taken off by the Hat and Coat Remover, he says "Hey! What is this?" but his mouth doesn't move.
Continuity mistake: When Butch opens the door to steal the ham from the fridge, the handle is initially on the right hand side of the door, but when he opens it later on the handle has moved to the left hand side.
Continuity mistake: In the scene set during the King Arthur and the Round Table era we see the end of a battle scene. The camera pans in on some dead enemy and we see a man in a helmet face down. The scene then changes but comes straight back to the dead enemy. The man in the helmet has turned away as if to survey the scene before him. Within a second he turns his head back to the original "dead" position. (01:19:30)
Revealing mistake: Many of the cavalry soldiers were carrying M-1 Garand rifles (WW2 era rifles).