Continuity mistake: Frost bumps into Mullett's car and breaks a brake light. Part of the red casing falls to the floor. When Frost walks over to look at the damage and sweep it away with his foot, a light bulb is now on the floor. (00:09:50)
Near Death Experience - S12-E1
Revealing mistake: At the end Jack wrestles the knife out of the attacker's hand and in doing so cuts his own hand. However in the extreme close up you can see the rubber knife is bending when Jack wrestles it away. (01:30:30)
Desk Sgt.: Mr Mullet wants to see you as soon as you come in.
Frost: I'll let you know when that is.
Trivia: R.D. Wingfield, author of the book "Frost" on which the series is based, hated the show.