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Continuity mistake: As Sally, Conrad, and the Cat look in the window of the house at the birthday party, a house next door is reflected. However, when the camera looks out at them, there's no house behind them.

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Continuity mistake: The pipe on the side of the house that Lawrence came out of as the house went back to normal, doesn't exist at any other time in the movie.

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Continuity mistake: In the wide shot of the countryside, when Joan and Lawrence are going to Joan's house, you hear the police siren, but you don't see the police vehicle. Suddenly, there are no other cars, and there's the Things posing as motorcycle cops right behind Joan.

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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: After Conrad tosses the candy to distract the kids, the one that hit Cat in the groin is in the foreground to get some candy. After a quick cut scene, he's standing triumphantly behind the other kids with his arms raised.

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Continuity mistake: As Cat yells, and after the swinging sequence, the kids are dropping their piñata bats. As the camera cuts to a few shots of close ups on the kids, you see no bats in their hands. After the shot widens out, you see the kids drop their bats again.

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Continuity mistake: When the Cat is on the picket fence, during the close ups of him, he has his elbows on the fence. When the camera is on Sally, you can see his right hand on the fence, instead of his elbow.

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Continuity mistake: When the Hummer comes out of the garage, it looks normal. When the shot cuts to the kids and then back, look at the back right wheel. You can see the back wheel of the S.L.O.W., and the end of the exhaust pipe.

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Continuity mistake: Towards the end of the FUN song, Cat has a bottle of milk on a silver tray balanced on his foot. When the camera is looking at Sally, the bottle on the tray comes up into view, but now, there's a glass of milk on it that wasn't there before.

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Continuity mistake: When the kids and Cat are in the S.L.O.W driving toward the red light, the gears and wheels in front of the windshield are not turning, and the rest of the time, they do.

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Continuity mistake: After the Cat, Sally, and Conrad get into the S.L.O.W., the Cat goes from having no goggles on preparing to leave, to having goggles on when pulling out. For the rest of the S.L.O.W. shots, he has no goggles.

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