Continuity mistake: In the first few scenes in the lobby of the Contention City Hotel, the clock is silent. In later scenes, it is ticking quite loudly.
Factual error: While flying across the U.S. before the Atlantic attempt Stewart lands and exits the plane. While doing a quick inspection of the airframe he approaches the engine and puts his hand on one of the radial engines cylinders which would have still been several hundred degrees, so should have resulted in a serious burn.
Continuity mistake: According to one of the characters, the firing squad is drawn from the 3rd Battalion of the 701st Infantry Regiment, the same regiment as most of the other characters. However, all the members of the firing squad (except the officer and sergeant, who are credited characters seen elsewhere in the film) have "710" on their collar patches. This can be seen when the sergeant, who has "701" on his collar patches, is briefing them.
Continuity mistake: When Bugs is trussed like a roast pig, the Tasmanian Devil puts salt and pepper on him and he leaves the salt shaker on the tree stump next to Bugs. But when the Devil unties Bugs later on, the salt shaker has disappeared.
Continuity mistake: When the Tasmanian Devil passes by the hamburger stall, you can see there is nothing next to the radio on the counter, but when we see a close-up of the radio in the next shot, there is now a mustard pot and a bottle next to it.
Continuity mistake: When Sylvester turns his head away from the television to avoid looking at the turkey, the top part of his body moves at the same time, but before he turns off the set a couple of shots later, the top part of his body is now facing straight.
Continuity mistake: When Quackie catches up with the mysterious man in his carriage, he is initially sitting by the window, but when he is speaking to Quackie, he is now sitting by the door.
Continuity mistake: When Daffy says "consequences, shmonsequences" to the Genie, he begins to walk away from him, but when the Genie zaps magic bolts from his finger tips, Daffy is back in his original position.
Revealing mistake: When Bugs is applauding with the audience after Daffy has blown himself up, his tail disappears for a second.
Factual error: Sgt. Brennan and the Base Commander are riding in a staff car. They get out to see new runway construction, and when they get back in the car, Sgt. Brennan gets in first, followed by the Base Commander. Sgt. Brennan is on the right in the rear seat. According to proper protocol, the junior person sits to the left of the senior person. He should have been to the left of the CO.
Continuity mistake: When the three pigs are listening to the wolf playing his trumpet in Hell, the position of the double bass behind the pig who is playing the piano changes between shots.
Continuity mistake: When Tom is placing a chicken under Spike's arm, Jerry takes a photo and you can see a trail of fake paw marks. When Jerry emerges from the dark room with copies of the photo, he takes one copy from the pile and has a look at it, but the picture shows no paw marks at all.
Continuity mistake: The character Sid Sorokin sings the song "Hey There" into a dictograph machine. He then plays it back and sings a "duet" with himself. However, the lyrics and melody at the end of the song are different from what he sang into the machine originally.
Factual error: When Brennan rides into town, behind the stage coach in the back street there is a pick up truck parked.
Continuity mistake: When Ralph is walking up the steps to his apartment, he has a present in his right hand. The present disappears when he goes through the doors, but re-appears when he enters the kitchen.
Continuity mistake: When Yosemite Sam says "I dares" to Bugs, you can see there is nothing behind Bugs, but in the next shot he is standing in front of a mountain.
Factual error: Montana introduces himself as Sergeant First Class Montana, but his helmet and sleeve insignia shows the rank of Staff Sergeant.
Continuity mistake: When Elmer is stabbing Bugs' hole with his spear, there are rabbit tracks around the hole. But when Elmer says "I'm going to kill the wabbit!" the rabbit tracks have disappeared.
Revealing mistake: When Speedy Gonzales is watching Sylvester drink Tabasco sauce from the tank that sends him miles into the horizon, watch Speedy's tail: it disappears before the scene ends.