Trivia

In the book, Liz, Alex, Frankie and Jeff were trapped in an abandoned cellar. In the film, Liz, Mike, Geoff and Frankie are trapped in an abandoned underground nuclear fallout shelter.

Thora Birch was paid a highly publicized seven-figure salary, due to her recent acclaimed appearance in American Beauty (1999).

The casting of Thora Birch secured the necessary funding for the film.

Guy Burt wrote the novel the film is based upon at the age of 18, not long after he left school.

Keira Knightley was only 15 when she filmed her topless scene.