About halfway through the episode, Dr. Harrison Wells is involved in a car wreck causing the car to be upside down. You can clearly see the car's drivetrain and exhaust intact. Towards the end of the episode they show the car again but without the drivetrain or exhaust, and the bottom of the car is different. It appears that they are using a completely different make and model car.
Near the end of the episode, when Harrison Wells climbs out of the overturned car and identifies himself to the police officers, the car's empty drive shaft tunnel is clearly seen with no transmission, drive shaft, or exhaust system.