Trivia: Smith tries to explain to the woman who Bob Marley is by singing a part of the song "I Shot the Sheriff." He also sang this part of the song (with a similar voice imitation) in his role as Will in one of the episodes from the series "Fresh Prince of Bel Air".
Trivia: The Brooklyn Bridge scene cost 5 million to make, the most expensive scene ever filmed in New York at the time.
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.
Trivia: Alongside billboards advertising Broadway musicals such as "Wicked" and "Legally Blonde: the Musical", there is a large banner showing a Batman/Superman logo. This is the filmmakers' wry commentary on a proposed Batman/Superman movie that was stuck in development hell and was never produced.
Trivia: If you look closely at the blonde woman at the bridge, whose eyes are bleeding, insisting that her child isn't infected, you will see she is the infected mutant who Robert Neville later catches to test the cure.
Answer: I thought people jumped on another helicopter causing it to spin out of control, and that one crashed into their helicopter.