They just churned out whatever fulfilled their contract. Some necessary transitions were missing, no explanation. Some scenes were assembled in the wrong order. A couple scenes are too dark to see what's going on. On breast is visible, but no nipple.
Hopper captures a school bus.
He takes a few kids out of the bus, and holds them deep in the swamp, in a cabin surrounded by hungry gators and water moccasins. He demands a ransom from their parents. Turns out that he kidnapped some poor kids by mistake, and their parents can only afford to pay the ransom in old rusted-out Ford 351 engines and microwave burritos. Or something like that. And then it turns out that the parents arranged to kidnap their own kids or something.