This slip takes place when Adrianne is being chased by the goons in a Big Ford Bronco. They are driving down a narrow road with the swamp on one side and impassible woods, or an embankment on the other side.

The goons spot Adrianne coming up out of the swamp and race toward her to run over her. Just in the nick of time, SwampThing gets between her and the Truck. Look at the truck as it comes down the road, the grill, the hood etc. It is either a big Ford Bronco or a Big Chevy Blazer (The older ones)

Once the Truck hits Swampy-ol-boy, the grill and front of the truck are obviously different.