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: When the little mouse disappears behind the elevator door, you can see the extension cord is missing, but reappears when Hippety and the mouse behind the door play back and forth switcheroo.
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: Before Tom is about to draw a line on the alarm clock on the blueprint, you can see on the left hand side of the clock there is an "A" and an arrow, and on the right hand side is some writing. When Tom draws the line, the "A", arrow and writing have all disappeared.
Continuity mistake: When the stork takes the baby to Mr and Mrs Pierce, he is holding the bag in his left hand when he walks up the stairs, but when he arrives at the flat, the bag is now in his right hand.
Continuity mistake: When Bugs discovers that Mr Hyde fired a hole in the wood that he used to board the door up to stop Mr Hyde from entering the basement, the number of planks change between shots.
Continuity mistake: When the man pulls the curtain rope at the theatre and breaks it, the bucket on a hook on the wall changes position between shots.
Continuity mistake: When Bugs is horrified to realise that he was holding a picket sign, the yellow paint on his tail disappears briefly.
Continuity mistake: When Bugs thinks he has escaped from Sam, he finds himself standing in the arena. At this point, you can see there is nothing beside Bugs, but when we see a full view of the arena in the next shot, look at Bugs and you can he has a shadow next to him.
Continuity mistake: When the crowd of mice await Speedy's arrival, you can the egg box used as the "El Cheese Bowl" has "EGGS GRADE A" on the front. But when Speedy returns with a piece of cheese, the front of the box now says "EGGS."
Continuity mistake: When Bugs is reading his book, he puts his carrot on the stand next to him. But when the apple falls on his head, the carrot has disappeared.