Continuity mistake: If you look carefully at the monster (Frankenstein) you will see that his face is different in the ending scenes. The reason is, during the movie you see the monster take the woman doctor and throw her out the laboratory window. You then see the monster kind of stumble, which he really did and broke his ankle. So in the final scenes they replaced Lon Chaney Jr. as wolfman with a stuntman, and Lon Chaney Jr. finished the movie as the monster.
Visible crew/equipment: During the movie whenever Bob Hope is pulled off the wagon by his team of horses you can see a board leaning against the wagon that was used to help the stunt man when he was pulled off the wagon.
Audio problem: In a scene when the Blandings first move into their dream house, Cary Grant (Jim Blandings) says something to a workman and his lips clearly don't match what is heard.
Revealing mistake: When Tom is punctured in the rear by the fork that Nibbles is holding, his tail is missing.
Continuity mistake: When Elmer catches Sylvester breaking his dishes, Elmer's position changes between shots.
Continuity mistake: When Chip slides down the drainpipe and holds on the frame to get to the window of Donald's house, you can see that there is nothing in front of the window, but when Chip is looking into the kitchen in the next shot, a cord has suddenly appeared.
Revealing mistake: When Mr. Peabody is fishing, it is obvious that he is in a boat on the floor of a studio. Rear-screen projection is used to show the ocean behind him, but while he is standing in the boat and trying to reel in his catch, the boat is absolutely motionless.
Continuity mistake: When Bugs Bunny says "I aims to", you can see he has a cigarette in his mouth, but when we see Bugs pacing himself a few seconds later, the cigarette has disappeared.
Continuity mistake: When Lucky Ducky peels off his egg suit, there are pieces of broken egg on the side of the boat. When the two hunters put their guns in the water in the next shot, the pieces of egg have gone.
Continuity mistake: When Sylvester and the dog are fighting in the cage, Tweety rushes out of the door to see them and he is initially standing well away from the door mat, but in the next shot he has moved a few inches back.
Continuity mistake: When Donald comes out of his tent at the beginning, he is holding a coffee pot and a cup and puts them down on the picnic blanket. When we see the blanket after Donald has put on his napkin, the coffee pot and cup have disappeared.
Continuity mistake: When Bugs is about to tee off at the first hole at the golf course, the objects behind him change position between shots.
Continuity mistake: When we first see the baby bird in its nest at the beginning of the cartoon, you can see that the nest is positioned on a branch, but when we see the bird attempting to fly later on, the nest is now in the crook of two branches.