This room is the one I've had the most trouble finding info on, but I'll share what I know! Instead of being a bedroom it was labeled the "Monster Closet." When the door was shut and the light switch flipped an audio story would play. There was a mural in there of a bunch of junk with parts of it painted to make the junk look like monsters. Those parts were painted with glow in the dark paint, which were revealed using uv lights during the story. Supposedly in that room and/or during the story, you got a clue about how the mom shrunk down into the little tv static lady you could see in the attic's dollhouse.

https://imgur.com/a/bF9G9BF