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This film was originally set to be released in the United States by 20th Century Fox, but was acquired in turnaround for theatrical release by Dimension Films.
The studio did not cast any character as a lead. Director Renny Harlin wanted no dummy characters or obvious victims and established a sense that "anyone could die at any moment" in the film.
The primary reason the film was able to be done on such a modest budget was due to a generous tax break from the Dutch government.
(at around 31 mins) The dominoes used in the domino close-ups were actually ten times the size of normal dominoes.
Clifton Collins Jr. prepared for his role by regularly traveling historic Hollywood Boulevard in a wheelchair and worked with a doctor to ensure an accurate depiction of a person with a disability.
As part of LL Cool J's preparation, he lost nearly 40 pounds and spent time with homicide detectives in the Philadelphia (PA) Police Dept.
Renny Harlin: [Finland] (at around 45 mins) When the others leave Vince and Gabe alone in the basement room, Finland's flag is seen on the wall.
Renny Harlin: [Finland] (at around 4 mins) In the beginning of the movie, when Reston and Morris are about to enter the house, there is a small hockey player figurine with a Finnish flag in the car that Reston plays with.