Continuity mistake: In the beginning of the movie, the doctor invites the two girls knocking on his door inside out of the rain because their car broke down. He gives them both water (laced with drugs). One of the girls knocks her glass over, spilling most of the water, which can be seen as the glass sits on the table. Then when the doctor leaves the room, while the two girls are talking, you can see that the glass on the table magically is filled again.acmorwin
Continuity mistake: At the very beginning of the movie as the camera pans around to the parked silver Mercedes, the wheels are straight. However, as the camera enters the driver's window to show the Doctor, the steering wheel is turned to the left (note the control buttons and wood effect on the wheel are well out of line from where they would be if the car was going in a straight line).
Revealing mistake: When Doctor Haier is explaining the operation to the captives, he says he'll sever the ligament in the knee. However, around the 1-hour mark when the captives are walking by the pool, you can see the rear woman's leg raise her left foot off the floor when she moves forward, showing she still has control over her knee.WesleyMiller
Factual error: During the surgical operation, Dr. Heiter makes incisions on the buttocks for the triangular flaps of connecting flesh; but the flaps are pointing outward, rather than inward. The only way to graft the buttock flesh to the face of the next subject would be with the buttock incisions pointing inward.Charles Austin Miller
Revealing mistake: The victims are supposed to be surgically connected mouth-to-anus. The majority of the time, their heads are far too high to be connected this way.