Revealing mistake: This is toward the end of the movie. The scene where Dr. Giggles has a waiting room full of his victims. If you watch closely, you will see the blonde corpse blink her eyes.
Continuity mistake: Towards the end of the movie when Dr. Giggles house blows up, Jennifer and her boyfriend fall to the ground twice.
Continuity mistake: When Jennifer is wheeled into the operating room, the nurse finds blood on the floor and discovers two bodies. Later, after the doctor has killed Jennifer's surgeon, she runs out of the same door, but there's no blood. (01:20:00 - 01:23:00)
