When Midge and Margo are chasing the car during the chase scene of the movie they are filming, they are shooting at it, holding the guns in their right hands, which they would not be able to do while operating the throttles on the motorcycles.
In the last action scene of the episode, the fuel tank on the truck that was repeatedly shown with flames surrounding it was not the source of the truck explosion because after the truck stops at the bottom of the cliff it shows the fuel tank intact.