Continuity mistake: When they are on the back porch, watch the Coke bottle. The level of the liquid in the bottle goes down, then up, then down, etc.
Continuity mistake: During the robbery, the taxi driven by Danny Green changes from an Austin to a Morris Oxford and back again. Both types are the same colour, but the Austin is the one with the rounded radiator grille, and the Oxford has a flat radiator.
Other mistake: The catapult on the battlements Jean uses to evict the castle guards is rather curious. First, there is neither a bow nor any torsion to 'power' the weapon, and secondly it just seems to cock itself, right after each shot. All that Jean does is pull the lever and none of her diminutive helpers stand by for any cocking work whenever the catapult arm is shown.
Continuity mistake: In the scene where the Reluctant is in the port of Elysium and the men are on shore leave, a truck load of MPs show up. Ttheir patrol leader tells Mr. Roberts that his men will be stationed along the starboard side of Mr. Roberts ship for the remainder of its stay in port because of the problems various members of the ship had been causing while on shore leave. No sooner do the MPs line up along the side of the ship do you see one of the ships crew flying down the dock on a motorcycle. When the motorcycle passes the ship the MPs who just 10 seconds before were lined up along the ships starboard side are now nowhere to be seen.
Continuity mistake: When we first see the blue chest of drawers that Elmer is going to buy at the antique shop, you can see there is nothing on the wall and there is also nothing next to it. But when the two gophers go and see the chest of drawers, a mirror is now on the wall and a green stool is next to the drawers.
Continuity mistake: When the man is imitating the frog to the agent in the talent agency, he is initially holding his hat, and then throws his hands up into the air. When his hands come back down, the hat has disappeared.
Continuity mistake: When Sam closes the door after escaping the lions, you can see there is nothing under his feet, but in the next shot a doormat has suddenly appeared.
Continuity mistake: When Manuel takes off his sombrero to give to the other mice, you can see he has a straw in his hand, but when we see Manuel in the next shot, the straw is nowhere to be seen.
Other mistake: Philip De Guard is the cartoon's layout artist, yet when we see his name in the opening credits, it is spelled "Phillip" instead of the usual "Philip."
Continuity mistake: When Uncle Pecos breaks his guitar string whilst rehearsing in Jerry's home, he goes up to Tom and pulls off one of his whiskers. The whisker Pecos pulls off is the one on the top left of Tom's face, but when Tom goes to check his face in the mirror a few shots later, the whisker Pecos pulled off is still intact, and the whisker in the bottom right has been pulled.
Continuity mistake: When the Coyote attempts to capture the Road Runner for the first time, he is standing on a bare patch of pavement surrounded by the puddle of glue he is spreading. In the next shot, the Coyote is now standing on glue with no bare patch, and when he realises he is about to be hit by the truck, he is standing on bare pavement in middle of the glue puddle once again.
Continuity mistake: When Calvin Q. Calculus has invented the portable hole, he says "Eureka!" and you can that there is a beaker on the desk, but in the next shot the beaker has disappeared.
Continuity mistake: When Elmer slams the front door after being tricked by one of the cats, you can see that the door has a handle and lock on it. But when the cat dressed as a salesman leaves Elmer's house later on, look at the door and you can see that it has now changed to a door knob and keyhole.