Interspersed with the footage of Charlotte's birthday party, there's a confusing picture of something red and black with odd writing on it. What is that thing?
It's hard to tell, but it was a picture of a wall with wallpaper peeling off in shreds, and under the wallpaper you could just glimpse something that might have been writing or a picture of some kind.
And since the ghost (or whatever) went to such lengths, we need to find that wall and see what's under the wallpaper. But where is it?
You might not have noticed it, but it's in the ruins.
Once you've watched the movie, go back to the ruins and look closely at the wall behind and to the left of the spiral staircase.
This makes Nancy pass out, which is rather odd. After you wake up, come back and look again, and this time you'll be okay.
How do I reach the wallpaper?