When the car is going down the street with no brakes, the long view ahead shows a stop sign on a cross street. There is no pothole or railroad track. On the far side of the intersection is a sidewalk with a grass shoulder and then a body of water. When the car stops, it does so by being driven into a pothole, and a train passes behind it as the are getting out.
In an often repeated error, when a brake line is cut and the amount of fluid shown lost, the driver would have greatly diminished to no brakes the first time they stepped on the brake pedal, such as shifting into drive or leaving the driveway. They would not be able to drive as far as was shown before a problem developed. Additionally, the pedal was shown not going to the floor, so the brakes were still operative.
When the car is going downhill with no brakes, a shot of the dash shows the tachometer and speedometers are reading 0, indicating the car was stopped when this shot was made.
Before the car runs into the pothole, smoke is seen rising from the pothole. This was supposed to be steam from the damage to the car.
At around 27 minutes in April is having a bad dream, Sutton is sitting on the edge of the bed, when her head moves to the side you can see four pill bottles on the bedside table even though her doctor weaned her off one of the original three prescriptions so there should have only been two at that time. The doctor later prescribed one other but throughout the film there were always four.
Modern vehicles run so clean that it would take several hours before someone was affected to the degree shown by the fumes from a tailpipe that were piped inside a construction trailer. Additionally, opening a window would negate them regardless of the door being blocked.