United 93

Audio problem: When auditing the recording of one of the first hijacks, the FAA reviewer rotates the tape reels back and forth in order to find just the exact words from the hijacker. As the sounds play, the reel moves barely half a turn, but the reviewer rewinds it more than one revolution, not nearly returning to where that sound would be.

Continuity mistake: At the end, during the fight scenes in the first class cabin, the number of overhead compartment doors that are open changes.

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Ziad Jarrah: Open the door. Open the door and nobody will be hurt.

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Trivia: Families of the 40 passengers and crew members killed on United Flight 93 cooperated in the production, offering Greengrass detailed background about their loved ones, down to the clothes they wore, what reading materials or music they had with them and what sort of candy they might have snacked on aboard the plane.

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Question: How exactly did Ben Sliney determine from watching the CNN report that the plane had struck the North Tower from the west, based on the position of the sun? Seems a bit of a reach given that there were huge, gaping holes on all 4 sides of the building, and theoretically, any one of those could've been the point of entry for the plane. (00:38:23)

Answer: The hole where the plane went into the building is shaped very specifically where you can see the outline of the wings, the middle of the plane, not to mention its size. The holes on the other side of the building did not have this same outline. It wouldn't be difficult to determine that was the point of entry. Not to mention the CNN report focused very heavily on the point of entry hole on the north tower and hardly focused on the other sides because of it until the 2nd tower got hit. They were very clear in the report where the hole was where it got hit. Wasn't difficult to determine with both witness reports coming in fast and the shape of the outline.

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