Factual error: In the scene where you see the underground train arriving in Tottenham Court Road station, the train has a red front. Only one unit of the stock in question had/has that combined with the original silver livery, and it never ran in service with it. Not to mention the fact that it wasn't applied until 2000, if not later. And the first trains used in service with red fronts rolled out of the shops in the 1980s, and this film is set in 1971.
Flight_fan
10th Apr 2012