These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Breaking the Fourth Wall: Whenever the Lodger speaks he turns his head to the camera. It's never really stated if he's talking to himself or actually talking to the player. There are instances however when he seems to talk to SOMEONE like pleading for help.
Nightmare Fuel: The game, even though it's not very violent, is still terribly scary with the ghosts being pure Body Horror, and the complete Paranoia Fuel going around the house during the survival segments. And the fact that you simply don't know what's going on.
It should be noted that Guests can be only seen in dark rooms but can move through the lit ones without breaking the lights until they 'materialize'. So if you keep all of the lights lit, a Guest can appear basically out of nowhere at any time and you can't see him coming.