Crew or equipment visible: As Darrow is opening the door to the kitchen, after the scene with the swinging ceiling light, a woman wearing a white long sleeve V neck blouse is visible, standing in the hall behind him.
Continuity: When Mrs. Belmont gives Joe a package that came in the mail, it is addressed to "Dr. Emily Darrow". When we see the package again in a later shot, it is addressed to just "Emily Darrow".
Continuity: Near the end, when Joe is in the submerged school bus the water is calm and the bubbles from his nose rise gracefully toward the surface. However, the bus is supposed to be in quickly moving rapids at the bottom of a waterfall. Visibility would be near zero, and he should be fighting the current (which he is not).
Continuity: When Joe is walking down the hall to the nurse after seeing the dead man go into the room, the elevator behind the nurse opens, but in the next shot, it's closed. This was because of a deleted scene in which Joe's dead wife was supposed to appear in the elevator.