Continuity mistake: When Nida is chasing Smart in her car, they are (correctly for England, in which it is set) driving on the left until they reach the level crossing. After they cross the level crossing, they are both seen driving on the right, with Nida trying to overtake Smart on the left. This has nothing to do with changing lanes during a chase, as Smart is, at that stage, unaware that he is being pursued.
Black Mirror (2011)
1 mistake in season 6
Fifteen Million Merits - S1-E2
Question: Is the phrase "pie ape" British slang, or a mix of slang words? Or is just an insult the writers created that isn't based on anything?
Answer: It's a derogatory slang term made up for the show.