Como explicado na Jurassic Park Wikia , há uma queda lateral da colina à esquerda dos carros:
Often incorrectly regarded as a goof is the fact that when the Tyrannosaurus exits her paddock from ground level with the road, there's the sudden appearance of a cliff when she pushes the car over it. In reality, there is in fact a cliff that acts as a natural barrier for the Tyrannosaurus, otherwise she would be able to exit her paddock through the gap between the fencing and the tunnel with ease. The diagram on the right illustrates what happens.