The Human Centipede (2009)

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

Dr. Heiter: I'm Dr. Josef Heiter, retired, but still very well known as the leading surgeon in separating Siamese twins. Six months ago, I designed a never seen operation, not separating any more but creating. I transformed my three Rottweilers into a beautiful three hound construction. Good news, your tissues match. So, I'll explain this spectacular operation only once.

Trivia: The movie spawned from a dark joke the director made. He had jokingly blurted out that a sexual predator he saw on TV should "have his mouth stitched to the a** of a fat truck driver." He and his friends found the idea so gross that he decided to develop it into a horror movie.

TedStixon

Question: When the two girls get out of their car due to a flat tyre, they begin walking back from where they just came. Why didn't they keep walking in the direction they were going instead of back tracking?

Michelle Ferris