Continuity mistake: When Yosemite Sam fires Bugs from the cannon, Bugs has "3 1/2" on his prison outfit, but when Sam orders Bugs into the prison cell after recapturing him, the "3 1/2" has disappeared.
Audio problem: When we see the moth singing on his way to the bar, his mouth doesn't move.
Continuity mistake: When Dr Jekyll enters his laboratory at the start of the cartoon, he locks the door with his key. After drinking the Hyde Formula, he turns into Mr Hyde for a short time before going back to Dr Jekyll. When Jekyll leaves the laboratory, he opens the door without unlocking it.
Continuity mistake: As the animated film opens, Charlie Brown's mailbox has a small red flag that is attached to the rear of the mailbox with the flag facing up. At the end of the film, the flag is attached near the front of the box and it is facing down.
Continuity mistake: When Daffy Duck is on the windowsill at Porky Pig's house, the windows are initially misted, but in the next shot they are now perfectly clear.
Continuity mistake: When Tom realises he is drinking sea water in the bucket Jerry gave him, he drops the bucket on the towel, but when he spits the water in the girl cat's face, the bucket is nowhere to be seen.
Continuity mistake: When Oliver introduces Stan to Harry at the snack bar, you can see that Harry's right arm is by his side but in the next shot it is resting on the counter.
Continuity mistake: When we first see the book that Bugs is reading at the beginning of the cartoon, there are words on the front cover and spine. In the next shot, the words have gone.
Continuity mistake: When Droopy is standing the door, he tells the convict he's going to call the cops. At this point you can see there is nothing next to Droopy on the frame, but in the very next shot a hinge has appeared.
Continuity mistake: When Quackie is at the cafe with Mary, their dog is sitting on the chair between them at the table. But when Inspector Faraway appears, the dog has gone.
Continuity mistake: When we see Dorlock Holmes at his desk at the start of the cartoon, you can see that he is writing with the feather in his right hand, but in the next shot he is holding the feather with his left hand.
Continuity mistake: After Reginald Fox ties up the dog in the bag, his monocle is on his left eye, but when he answers the door in the next shot, the monocle is now on his right eye.
Character mistake: On the sign outside Dr I.Q. Hi's headquarters, the word "Stratosphere" is spelled "Stratopere."
Continuity mistake: When Tom removes the packaging, you can see that it reads "Life with Tom by Jerry Mouse" on the front cover, but when we see Tom reading the book later on in the cartoon, the wording has disappeared.
Continuity mistake: When Elmer is holding onto his pick after Bugs dives into the hole, Bugs comes up and cuts his suspenders, revealing his girdle. When Elmer pulls up his suspenders, the pick has disappeared.
Continuity mistake: When the cat places the tiny canary on to the plate, the salt and pepper pots on the table change positions between shots, and the cabinets in the background disappear. He also has a knife and fork in his hands, but after the canary says he's been sick, we return to the cat and the knife and fork have disappeared.
Continuity mistake: The handle that Bugs uses to try to escape was originally not on the door which the scientist locked up when Bugs entered the castle.
Continuity mistake: When Dr Jekyll arrives at the park, he is carrying a bag of carrots. But when he is sitting down on the bench, he is holding a carrot but the bag is nowhere to be seen.
Continuity mistake: When Daffy Duck takes the knitted sweater from his wife, you can see that she is holding two knitting needles in her hands, but in the next shot the needles have disappeared.
Continuity mistake: The handle on the door changes during the scene where Sam throws a lighted match into the Powder Room on Bugs' ship.