Stupidity: In the scene where Billy, Stu and Sidney are in the kitchen (when Sidney finds out they are the real killers), they begin to stab each other as a part of the plan to fool the police into thinking they were almost killed by Sidney's father, whom they were going to frame for the murders. They were planning on killing Sidney and her father, so it makes absolutely no sense that they begin stabbing each other BEFORE killing Sidney and her father, especially since Sidney would be at more of an advantage of outrunning them should she have the opportunity to since they have both been stabbed multiple times.
Stupidity: Dewey and Sidney jumpscare each other at the front door. There's just no possible logical reason for a deputy (or ANYONE) to be holding the mask the way Dewey is in the scene. If he were leaning against the door, he would have lost his balance or reacted in any way to the door shifting. (00:30:30)
Suggested correction: Perhaps he was going to knock on the door with the mask. And Dewey didn't call out for Sidney.
I am not sure who would almost-but-not-quite knock with his hand wrapped in a mask and holding perfectly still keeping the pose, facing the opposite direction. It's a pose completely unnatural especially looking frozen and not in the middle of something else. (I amended the part about calling out, it was wrongly phrased since I wanted to say the exact opposite, thanks!).
He was about to knock on the door and was then looking behind him, probably heard a noise. He ain't the most solid type either.
I personally think this is a good stupidity entry. The stupidity section exists for stuff that isn't technically mistakes, but is still irksome or just silly. And this fits that. It's good for a quick jump scare, but doesn't really add up. It's a piece of evidence, so he probably wouldn't be touching it anyways, the way he's holding it is completely unnatural (nobody holds a mask they just picked up off the ground like that), and it's conveniently held at exactly the right height and position to be in Sidney's face when she opens the door. The movie was flying in the face of basic logic to manufacture a quick scare. And it's effective in context... but it doesn't really make sense if you dissect the scene.
