In several scenes where the bear is shaking and overthrowing the car, it is clearly possible to spot a sort of crane that is pushing the car from the side.
A character is on the top of a car but in the next shot he is gone, and then the following shot he is back on the car.
In some shots, the car was a 2000-2002 Chrysler Town & Country minivan. However, the car was a 1998 or 1999 Chrysler Town & Country minivan.
When the two couples are coming out of the big pipe after the attack of the bear, you can see in the background a person with glasses wearing the bear costume.
As the closing credits are rolling an apparent staff personnel walks by the screen (left to right) wearing something similar to a UPS- style uniform. Moments later a very visible camera flash is seen as the bear is on the hood of the van shaking it.
As the end credits are rolling you can clearly see a crew member wearing a brown shirt run in front of the camera while the Bear frolics on the Van.