When the car carrying the agents and Collette pulls up underneath an archway to bring her in for questioning, both rear car doors open and both agents and Collette get out. In the next shot, only the right rear car door is open and the agent on the right hand side is open and then Collette and the other agent get out.
When Collette gets on the train, the camera focuses on a passenger but the view behind her suggests the train doors are open and tucked behind the double-layer glass but the sound effect of the trains movement is continued.
In the police station Windows 95 (released in 1995) is shown several times on computer monitors. The movie is set in 1993.
In the tube train and station at the start of the film none of the Central Line maps show North Weald or Ongar which, in 1993 when this film is set, were both still open and displayed on the maps as restricted service. These stations did not close and come off the maps until September 1994.