As the Jeep is hanging off the cliff its clearly visible that the Jeep is out of shape in relation to surrounding objects and moving black spots around the tires are visible (no shadows because its raining) changing in size for about two seconds. This is caused because the car was put into the picture afterwards.
When the Viper shoots the grappling hook to rescue the Jeep thats about to fall off the cliff, a red film crew Van is visible. Moments before the Viper and the Jeep were the only cars in the woods.