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Continuity mistake: While Evan talks to the "prostitute Kayleigh", the piece of pie on the table changes position between the shots.

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Trivia: At the theater where Evan and the others go, the films Seven and Dumb and Dumber are shown both from the maker of this film, New Line Cinema.

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Trivia: The psychiatric hospital where Evan goes is the same on seen in Halloween: Resurrection and Final Destination 2.

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Trivia: There are 4 different endings for the film.

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Trivia: The name of the film comes from the Ray Bradbury novel "A sound of thunder" a time travel book.

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Trivia: The diaries used by Evan are the very same ones used by Kevin Spacey in "Seven".

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