Goofs

When Collie opens the door at 24:04, sunny green outdoor foliage is visible through the doorway, yet in the next shot, Collie is just proceeding into another room of the house.

Early in the film, the person in the emergency room's heart flatlines; asystole or absence of any electrical activity. Shocking or defibrillating will do no good in the absence of cardiac activity. The proper treatment would be to give intracardiac epinephrine, followed appropriately as necessary.

When Bruce Dern and Jason Patric are sitting in the car looking at the mansion, about 30 minutes into the movie, the reflection of a crew member is visible in the chrome of the driver side rear view mirror.