My nephew walked In on that character getting eaten and I didn't notice until he ran off. Kind of funny because I told him not to watch It earlier and he just couldn't help himself.
Also, about the "something keeping them from reality" theory, in the first dhmis right before everything goes all creepy and horrible, it cuts to a shot of a bunch of cameras and stuff with eyes. It's also shown in episode 4. It could be saying that those are the things keeping them. Also it could be symbolic of something, like the classic "the teachers are based on flawed ways to teach children stuff" theory.
