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