When Tom Archer drops off his fare at the hotel and goes across the street to buy flowers his cab is a Ford. When the cab blows up it turns into a Dodge or Plymouth.
Kelly is driving the cab and the brakes stop working. She's going downhill and she goes up the ramps of a delivery truck. She and her passenger jump out of the car, but the doors aren't open.
When Kelly crashes into the inside of the truck, there clearly are no taco shells on the vehicle until it is shown in the next shot, where the trunk of the vehicle is now covered in taco shells.