Remember Magic Eye pictures? Those images that looked like prog-rock album covers unless you squinted and unfocused your eyes just so, and then you could kind of see a sailboat? These photos are kind of like the psychological horror version of that. You'll feel something wrong, you'll just have to look closely to see.
There's nothing like a well-trained magician to impress us. Using simple techniques like sleight of hand and misdirection, the magician can make us believe, if only for a second, in honest-to-goodness... wait, this guy isn't a real magician? He's just a tool that's okay at video editing? Oh. Well, then we can simply watch and laugh at him.