Lizzy Caplan thought this was a romantic movie until her second audition, where she read a scene. After she was offered the role, she found out it was a monster movie, and the actors weren't allowed to read the script until after they signed on.
The head of the Statue of Liberty is shown about 50% larger than actual size. CG supervisor David Vickery said in an interview that many people imagined the head being much bigger than it actually is, and that the size was increased due to complaints that the head looked too small in the trailer.
The first trailer for this movie played before Transformers: Le film (2007). It showed a giant explosion in the heart of New York City and the Statue of Liberty's head being thrown down a street. It was shot with a hand-held video recorder. There was no title.
The running time of the film, without credits, is about 80 minutes, the length of a long-running MiniDV tape, a common format used in consumer camcorders.
During the first weekend of the release, many theaters posted signs warning guests that the hand-held camera movements may cause motion sickness.
Laetitia Casta: Model in the poster inside the Sephora shop exterior where Lily, Marlena, Rob and Hud stop after running from the Brooklyn Bridge, before Rob enters the electronics store.