That face just shows up next to Harry Potter there, but he can't see it. Who can? You and me. "Oh s**t!" we exclaim. But no one in the movie does, because no one saw it.
If we're to believe that the malevolent spirit in a horror movie has the ability to appear and disappear at will, as is generally the case, then why would it ever appear in a way that the people in the movie can't see? Does it need to cross the hall to set up a better scare? Was it hiding just out of view in the bathroom mirror because it needed to check its hair before it ate a soul? This seems needlessly complex. The heights of that complexity are stomped a new mud hole by Netflix's The Haunting Of Hill House.
This entire video exists to point out all the secret s**t in that show. There are dozens of scenes with hidden ghosts in them. Hidden ghosts. Ghosts that are just there for eagle-eyed viewers or dedicated YouTubers to find. The people in the show never see them, thus telling us that the afterlife is so goddamn boring that you just loiter in the background of the world of the living for no reason at all.