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Factual error: The signalling board in the control tower animates train Pelham 123's movements in such detail that the police can tell when it is moving and when it has stopped. Indeed the police deduce that the hijackers have abandoned the train from this. In reality this could not happen. Subway tracks are divided into variable length blocks typically hundreds of yards in length. The signalling boards are only able to show which block a train is in. The only way to tell if a train is moving is when it transits from one block to the next and the only way to estimate speed is how quickly it occupies successive blocks. A slow moving or stationary train are thus not able to be distinguished from the board.
Character mistake: When the hijackers separate the lead car and back the rest of the train away, the conductor says in amazement, "I didn't know these things went backwards." Any subway conductor would know that trains run in either direction. Most trains relay (reverse direction) at their terminus, and any subway train can be operated from either end.






