When the police chase the van after the fight at the pizza parlor they are driving a 1974 Plymouth Satellite police car. Then when they speed through the wedding party it turns into a 1970 Mercury Montego police car.. Then when it crashes into the green car it's a 1968 Plymouth Satellite police car.
Although the hit song "Chevy Van" is played often throughout the picture, and the movie itself was retitled "Chevy Van" on re-release, the van in this film is actually a Dodge.
When the police chase the 'Straight Arrow' van after the fight at the pizza parlor, the siren is blaring but the police lights remain on the squad car remain off.
When the green van crashes during the drag race at the beach, you can clearly see that it is not the young kid portraying the van owner driving it, but that it is instead an older man, undoubtedly a stunt driver.
When the two police officers take off after the yellow and green van when they are drag racing down the street, you can see the reflection of two crew members operating a camera and a third gentleman standing there watching the filming reflected in the rear passenger side window.
When Bobby drops Tina off down the street from her house after spending the night on the beach, you can see a crew member's reflection in the passenger side wind wing glass and two rectangular production light reflectors reflected on the side of the van as he pulls away.
As Dugan pulls out to drive up to the starting line for the final race, a couple of crew members with a camera and a mic boom can be seen n the side of the van.