Continuity mistake: Multiple scenes: On every exterior shot of the train, you can only see one row of windows across the upper galley section. However, whenever there is a scene shot on the upper 'galley' level, there are two rows of windows, one right above the other. The external shots were filmed using a Chicago Metra train (which uses 'bilevel' galley cars), the internal scenes were filmed on a set in Montreal, Canada.Fayor
Continuity mistake: In the scene where the bomber shoots characters played by Jake Gyllenhaal and Michelle Monaghan, when filmed vertically, there's a splodge of blood in front of Michelle's face. However, when the camera is on the ground, filming her face, there's not even a vestige of blood on the floor when it should be exactly in front of her face.
Continuity mistake: When Colter fights the guy in the brown coat at the train station, the sun changes between shots.