Continuity mistake: When the killer (Jigsaw I suppose) is releasing Tom's children from being hung by their hands, right when they get down the rope holding them up disappears.
Scary Movie 4 (2006)
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Directed by: David Zucker
Starring: Bill Pullman, Anna Faris, Regina Hall, Craig Bierko
Genres: Comedy
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Oliver: We'll build our own tripods. Ours will have four legs.
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Answer: Ads are often made months before the final editing of any movie. Therefore, it's not unsual for something to be in an ad but not in the final movie (or to happen differently, or a different shot, or different music, etc.).
Myridon