Continuity mistake: In the final scene Regan hails a taxi as it pulls in the taxi is passed by a green Jaguar and a yellow Ford Transit. When the angle changes, these two vehicles should pass by, but they don't. Then when the taxi turns round and drives off, the vehicles in front of it should have been seen in the previous angle but they weren't.
Factual error: When Carter is reading the newspaper there is no date on the front page.
Visible crew/equipment: When Carter is chasing the teenager with the number plates, people standing around watching the filming can be seen in every shot.
Audio problem: When Carter is searching Jean Jackson's house she asks him if he has a warrant - although the camera isn't on her you can see her reflection in the mirror and you can see that her mouth doesn't open when she is asking Carter this.
Answer: Scripted.