The cars consistently change from '71 to '74 Dodge Chargers.
While escaping from the warehouse, the mysterious car knocks off the school bus' driver's side door. In the subsequent chase, the door is back on in several shots.
Throughout the film the car is referred to as being black. It is never black. Sometimes it is yellow and other times it is dark green. It is always covered in mud.
The car is twice referred to as a "sedan", although it is very clearly a coupe/muscle car, more precisely a '71 or '74 Dodge Charger.
Stunt driver's hand visible on the wheel when the mysterious car is chasing the first girl through the desert.