Continuity mistake: When Jerry first becomes buff after drinking some of the milk and starts approaching Tom to beat him up, Tom sees a book and grabs it then hits Jerry. Before Tom grabs the book, it's yellow. When he grabs it, it's green.
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: Pearl is singing a song to mock her boss at the factory. She goes through the first lines about being too worn out "to play." With her feet on the work table, she puts her hand under her chin. In the background, a fellow seamstress is watching. In the next shot, her arms changed position, now crossed in contrast to the previous shot. (00:04:40)
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).
Continuity mistake: When Humphrey Bogart comes into the kitchen after being hit in the face by a coconut custard pie, the number of cream spots on his dinner jacket changes between shots.
Continuity mistake: Bob Hope asks to take a peek at the execution chamber. He peeps from the hole, nudging away the lid with his forehead, and turns away. The lid came to a complete stop, but in the next shot when Ronnie walks away here's the lid swaying again as if he had moved his head from the window just that moment. (00:02:25)
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.
Continuity mistake: At the start of the cartoon, you can see the bell is at the far end of the reception desk, but when the businessman goes to punch Elmer after being woken up by Daffy laughing, the bell is now positioned further up the desk.
Continuity mistake: When Tom is about to drop the iron on Jerry, he is holding some cheese on a piece of string in his left hand. When the iron drops on Tom's foot, he is no longer holding the string.
Continuity mistake: When Elmer Fudd goes red in the face when he is with Bugs Bunny in the boat, the water that was coming out of the "Tunnel of Love" only a few seconds earlier has completely disappeared.
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 we see Pluto's kennel at the start of the cartoon, there are initially three bricks on the left hand side of the entrance, but in the next shot there are now four.
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.