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Other mistake: While signing the contract, when Conrad is supposed to "sniff this", he moves to his position a second before the Cat says his line and bobs Conrad's head down.

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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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Plot hole: When Conrad, Sally and the Cat pull up to the house the camera cuts after they stop. The Cat is suddenly missing, and as the kids go up on the porch, Lawrence pops up from beside the porch. First, how did he beat them there, when he was a couple of minutes behind? Second, when the kids were approaching the house, how did they not see Lawrence crouching beside the porch when he would have been in plain sight from the direction of the driveway?

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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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Other mistake: When the Cat is using the periscope to look at Nevins, the range on it reads between forty-nine point two meters, and fifty-two point four meters. These distances translate into just over one hundred sixty-one, and one hundred seventy-one feet respectively. The kids and the Cat were no more than about fifty to sixty feet at best away from Nevins.

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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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Character mistake: After the things let the dog out, Larry calls Joan and tells her that the kids let him out, and he will get him (the dog). Later, when he's downtown with the dog, he has the line about "when Joan finds out you've escaped, Conrad's out and I'm in". Where is the surprise? He already called her, so she knows!

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Factual error: When driving the S.L.O.W., the Cat tells Conrad to "punch it!". When he (Conrad) does so, the Cat squashes up against the windshield. This goes against physics. Unless they were going backwards, he would have been pressed into the seat.

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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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