Continuity mistake: When Thomas uses a fishing rod to hoist himself up to Tweety's cage, you can see that Tweety is resting himself with his arm on the swing. But when we see Tweety in the next shot, his arm is on his chest.
Continuity mistake: When the delivery man gives Cecil Turtle a gift while he is resting on the beach, there is a pink ribbon on the side of the box that disappears in the very next shot.
Continuity mistake: In the scene towards the very end of the film when Sister Ruth goes to see Mr. Dean, she is wearing a great deal of lipstick - in fact, her make-up is indicative of her having left the religious order run by Sister Clodagh. She becomes hysterical and faints. When she wakes up she's no longer wearing any lipstick (no indeed any make-up at all).
Audio problem: When Bugs says to the kid, "Cut it out, kid! Somebody will get hurt!", his mouth doesn't move.
Continuity mistake: When the dogs run away from the Mexican hairless dog after thinking she's a skunk, the Mexican dog's ears are pointing up but in the next shot they are pointing down.
Character mistake: When we see the sign in the window of the music shop, it reads "This Week Dance Record" which doesn't make much sense. Surely it was meant to read "This Week's Dance Record."
Continuity mistake: When Jerry replaces two keys on the piano with a mousetrap, Tom gets his finger caught and there is a catch lever at the bottom of the trap. But in the next shot when Tom pulls up the mousetrap and his finger expands, the catch lever has disappeared.
Continuity mistake: The sardine tin that the ant uses as a piano has a rectangle in the middle of the lid at the start of his act. The rectangle disappears a little later on, but when the singer is hit in the face by a banana, it is back again.
Continuity mistake: When Tom is tip-toeing past the gate at the start of the cartoon, Spike is sleeping and you can see there is nothing around his neck, but in the next shot a dog collar has suddenly appeared.
Continuity mistake: When Jerry rings the gong to tell Tom and Butch to stop fighting, Tom goes back to his seat by the table. When he sits down, the vase on the table next to him changes colour from pink to blue between shots.
Factual error: After the credits, at the beginning it shows "New York 1883" but in an early scene when Powell is reading the newspaper in his study he is complaining about the Mayor of New York whom he calls "Honest Hugh Grant." Hugh J. Grant did not become mayor until 1889.
Continuity mistake: Bongo the bear, riding in a car of the circus train, looks out the window. There are four vertical bars on the window - but when seen from outside the train, it has six bars.
Continuity mistake: In the scene where Jeb shoots Prentice, we see Prentice with his right hand covering the wound just below the right rib cage. When Jeb carries him inside, Prentice's right hand is now covering the left side rib cage. (01:05:55 - 01:06:35)
Continuity mistake: When Tom starts beating the curtain with a book when he thinks he has captured Jerry, there is a chair behind him. There is no sign of the chair in the next shot, but when Jerry whacks Tom with a golf club, it is back again.
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.
Other mistake: After the fade out, the "The End" board shows it as an "MGM Tom and Jerry Cartoon." The two stars were not in this short at all.
Continuity mistake: When Robert Taylor escapes from the asylum, and is driving the second car he steals, the car is shown at least once with windshield wipers pivoting from above the windshield, then shown with the wipers pivoting from below the windshield. Clearly, these are two different cars. I think the studio borrowed wiper footage from the scene in which he is driving the first stolen car, to use at moments in the scene in which he is driving in the second car.