Factual error: The grenade Robert Neville uses at the end of the movie has a blue and brown colored lever. This feature is only used on the M69 practice grenade and not the real M67. The lethal grenade lever is completely green.
I Am Legend (2007)
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Directed by: Francis Lawrence
Starring: Will Smith, Alice Braga, Salli Richardson-Whitfield, Charlie Tahan
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More mistakes in I Am Legend
Neville: Nothin' happened the way it was supposed to happen.
Trivia: This film held the record for best opening weekend for a film released in America in December, until the release of The Hobbit: An Unexpected Journey and later the release of Star Wars: Episode VII - The Force Awakens.
Question: The question is if all the bridges and tunnels to Manhattan are destroyed, how does one drive from New York to The Colony in Vermont? How do Anna and Ethan drive to Manhattan to meet Robert Neville in the first place?
Answer: In the alternative ending Dr.Neville, Anna and Ethan are seen driving a car over a bridge that wasn't destroyed. The army would need to leave a entry/exit point, but it would have been heavily guarded until everyone died.