Continuity mistake: After Pongo spots Anita and Perdita walking towards the park, Pongo moves the time forward on the clock and he leaves the dial's hinged bezel open as he rushes to the door and barks, but when Roger checks the time on the clock the bezel is closed. (00:06:20)
Continuity mistake: When Yeggs Benedict serves Inspector Willoughby the dish of Grenade of Succulent Pig, you can see under the pig's mouth there are tomatoes, but in a close-up of the pig in the next shot, the tomatoes have changed to green lettuce leaves.
Continuity mistake: When Sylvester is pursuing Speedy on his motor bike, Speedy stops at the end of the cliff. But when Sylvester sees the cliff, there is now no sign of Speedy.
Continuity mistake: When Sylvester and the bulldog try to blow up the chain with some TNT, you can see the explosive has the wording "TNT" on it. But when the two take the explosive and put it into a hole, the "TNT" has gone. The wording reappears when the explosive falls out of the pipe.
Continuity mistake: When we see the boomerang box, there are words on the side reading "One Boomerang" and "Returns to Owner." When we see the Coyote holding the boomerang in the next shot, both the words on the box have disappeared.
Continuity mistake: When Sylvester is trying to sleep in his bed at night, you can see next to him there is a dressing table and on it there is an alarm clock and a hairbrush. Watch the hairbrush: in some shots it is next to the clock; others it isn't.