Continuity mistake: At the beginning of the film in the scrapyard, we are shown a car suspended by the grab crane. When the Juggernaut appears and all starts to go wrong, the same car drops and barely misses the psychic. Later, we once again see the car suspended in the grab crane.
Continuity mistake: One of the ghosts (Juggernaut) appears before it has been released. Juggernaut is the last ghost being released, yet we can briefly see him disappear when Rafkin is looking for Bobby.
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: Near the very beginning of the movie, Arthur (Tony Shaloub) trips over his son's scooter and spills coffee on himself; throughout the scene, the stain keeps changing size and location. (00:13:10)
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.