Continuity mistake: In the scene where the psychic and the father are walking through the halls carrying the plate of glass as protection, you can see the trees outside blowing in the wind. Earlier, they showed that all the windows in the house closed up, making it impossible to see outside.
Continuity mistake: At the end when all the ghosts are gathered, it shows them rotating. After the counting, some ghosts change position. The torn prince first stands next to the angry princess, but later they are a few places away from each other, just like the horrible child and the dire mother.