 In the final train scene, a Chicago L platform sign (Merchandise  Mart) is clearly visible, though out of focus. Footage of the sign  must have been looped to make the station seem much longer than it  actually is: on the side of the station thats open to backlight,  there are only two such signs mounted on metal balustrades, about 25  feet apart, but in the movie the train appears to pass more than a  dozen.