An enormous amount of subtle foreshadowing takes place in the first half.
Especially the wallpaper. The green floral motif throughout looks like either grasses or flames, depending on how you look at it. The wallpaper peels from the heat, and beneath it is flesh-red plaster that looks similar to the inside of the building in In the Mouth of Madness. He's in his own personal hell, made because he got sucked into white-bread Hollywood from off-broadway stardom. It's actually lampshaded too, but the fact that the building doesn't collapse from the flames or stop burning.