Eli
This is a Netflix horror movie. At the beginning, there is a scene where they are going from a motel to their car and the kid is in a suit like a hazmat suit. There are some drunk people by a trailer that make fun of him. That's all we ever see of them.
At the end when it's revealed that Eli is basically a son of the devil, he should have gone back to that trailer and utterly destroyed it before moving on. This was suggested by a friend and I agree, it would have shown his evil 'mission' and brought it full circle.