Greg Grunberg was originally set play Detective Wallace MacTee but was forced to drop out last minute due to scheduling conflicts with his role on Heroes (2006).
Actor Paul Sampson suffered a minor eye injury during one sequence in which he is shot by Ben Cross' character due to a premature squib detonation. This footage is included in the finished film.
During the fast Steadicam move towards Derek firing the machine gun just after the police cars arrive, it's possible to see the edge of something attached to the camera on the extreme left of frame.