Factual error: Rescuer and US Marine Jason Thomas is an African-American in real life, but was portrayed in the film as a white man. The film's producers realized the mistake only after production began, and apologized to Thomas, whose identity had not been widely known for years after September 11th.
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Factual error: At the end of the movie, in the hospital we see a Sierra Mist can where the other families are waiting. It is true that Sierra Mist was brought out on the market in 2000, however the can has the label of a recent Sierra Mist logo from 2003-2005. The logo used in the 2000-2002 time frame is much different looking.
Factual error: In the opening sequence of World Trade Center when the police men are beginning to patrol the streets the camera pans around a New York City street and a Charles Schwab ad can be seen with the "Talk to Chuck" slogan. The "Talk to Chuck" campaign was not introduced until September 2005.
Factual error: In the scene where the dead police officer's pistol starts going off, the gun would not have been able to fire more than once. Recoil operated guns can't function without a certain amount of resistance being applied to the grip. After the first round went off the slide wouldn't have been sent rearward, and the gun would have simply jammed.