Continuity mistake: When Tom is playing with a ball of yellow wool next to Joan, look at the chair next to the table and you can see that George is missing, but in the next shot he is back in the chair.
Continuity mistake: When Sam confronts Bugs by the Powder Room, Bugs takes out a match, lights it and throws it into the Powder Room. You can see that the packet of matches is now one short. When Sam tells Bugs that "If you does that once more, I ain't a-goin' after it!" we cut to Bugs and when he takes out the packet, it is now full with matches again.
Continuity mistake: When Tom attempts to squirt Jerry with the bottle of seltzer, Nibbles sets the freezer to Quick Freeze which freezes the floor and Tom is left frozen. You can see that when Tom is frozen, the bottle leaves an icicle of frozen water, but when Jerry and Nibbles dance around Tom at the end, the icicle has disappeared.
Continuity mistake: When Jerry and one of the puppies hear Tom whistling during the thunderstorm, you can see that there is a newspaper by the puppy when he and Jerry look out from their shelter, but when Tom falls into the river, we cut back to Jerry and the puppy and the newspaper has disappeared.
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)
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: When Quacker shows Jerry the picture of the ugly duckling in his book, you can see the book is standing up, but when we see the picture in the next shot, the book is lying flat on the ground.