Boom mic visible: As Ellen and Michael leave the arcade, the shadow of a boom mic is visible on a wall behind them.
Revealing mistakes: In the scene early in the movie where Raven shoots through the door to kill the female witness, the slide on his 1903 model Colt pocket automatic doesn't cycle and no empty cartridge is ejected, indicating that the pistol was loaded with a low-powered blank.
Continuity: When Gates discovers Graham and Raven sleeping, on the train. Raven's head is on Graham's shoulder, but the next shot after the one of Gates retracing his steps shows them separated.