Continuity mistake: When the children hear the bump coming from upstairs, they go to investigate. Conrad says "it sounded like it was coming from the closet." The closet is facing the stairs when they go up them. Later in the film, a shot is shown where you can see the rooms in the whole house together. The closet isn't on this shot, so where has it gone?
Continuity mistake: In the scene where the cat's tail accidentally flips Sally onto the couch,we see that the couch is very far away from where the cat is, yet after a 2 to 3 second shot of a CD player coming out of the cat's hat, we see Sally standing behind a chair right in front of the cat, this is impossible as no human can move this fast.
Continuity mistake: The first time Lawrence comes in (as the trio are jumping on the couch), he starts sneezing while standing under the Cat. He's in the middle of the living room and facing the front entry; but in the next shot, he's on the edge of the living room and facing in. He jumps back and forth throughout the scene.
Continuity mistake: In the scene where Alec Baldwin is in the house to discuss Conrad going to military school he is dressed for work. He puts his briefcase down and sets his sunglasses on top of it. In the next scene the glasses are behind and to the side of the case and in the next scene they are back on top of the case. And so on.
Continuity mistake: When Sally, Conrad and the Cat are getting on Mrs. Kwan, they are facing a tunnel with a table and two chairs above it and a water slide behind them. When they go through the tunnel they end up coming out the same tunnel, with a table and two chairs above it, before they go up the same slide Mrs. Kwan first came down, except they didn't show the toilet at the start - it was a tree.
Continuity mistake: After the dog is secured and the kids and Cat are running, at one point Lawrence is only about thirty feet behind them. When they get into one of the kiosks, Lawrence is nowhere near, and so couldn't have known where they went. But a minute later, he's sliding down the pole and pushing through the crowd in the party area after the trio.
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Continuity mistake: When the Cat goes to "look under the hood", he looks back over his shoulder at the kids after passing gas. You can see the definite line of white on his face that is well short of the hairline. The next time that you see his face, the white goes all the way into the hairline.