Continuity mistake: At the start, Robert Neville drives into some yellow poles, only to drive into them again in the following shot.

I Am Legend (2007)
Plot summary
Directed by: Francis Lawrence
Starring: Will Smith, Alice Braga, Salli Richardson-Whitfield, Charlie Tahan
After a female doctor finds a cure for cancer, the cure mutates into a deadly virus that affects everyone. Lt. Col. Robert Neville is working on the cure when he has to get his family out of Manhatton, because they are closingit off. Once all of the uninfected are gone, only soldiers and the infected remain. Neville tries desperately to find a cure using his blood and find other survivors. When he captures the Alpha Female, the Alpha male doesnt like that very much. Neville is running out of time and hope as the darkness closes in.
Raff
Neville: God didn't do this. We did!
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.