When the Bronco is underwater at the end of the movie, Claire's hands are tied to the steering wheel. Doug rips the steering wheel off. Anyone who has worked on cars knows you need a puller to get a steering wheel off. Also, the steering wheel is gone when Claire swims to the surface.
At the time of the filming, the St. Charles Streetcars were not running 100%. When they show the Canal St Car, one sense that shows the car running on the right side tracks toward the camera, it's actually on the wrong side. Later when he's going to her apartment, one shot shows the streetcar running on the right side tracks (as the norm), and the trolley poles are up. Later when he gets off the car, it's on the opposite side, wrong direction, rear pole is down, and he gets out through the rear door as if it was main door.