 CONT: In the subway station fight, Hellboy fights the monster as the  train comes into the station and leaves again. In a shot a minute  later, the monster swings its arm at Hellboy and the reverse shot  shows the train passing behind Hellboy again. However, in shots  before and after, there was no second train on the heels of the  first that passes by for a split second. The shot must have been  moved from the prior sequence.