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The Human Centipede (First Sequence) (2009) Poster

Goofs

Audio/visual unsynchronised 

Whenever Dr. Heiter walks in the room where his patients lie down, a breathing machine can be heard. However, none of the people are connected to a breathing machine with tubes, so this sound doesn't make sense.
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Continuity 

When Lindsay spills her drugged glass of water, it is nearly empty, and approximately 3/4 of an inch (one centimeter) of liquid remains. In the next scene, after Dr. Heiter goes downstairs and the woman says, "It's freaking me out!" the glass is half-filled with water again.
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When the doctor joins the three for the first time and begins taking photos, he is using a Canon Digital Rebel. When the camera angle changes and shows him taking photographs again, he is shown to be using a Nikon camera.
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When one of the policemen arrived in the house, he breaks the door of the room with the centipede, but the door was open before the mad doctor crawling to the pool room.
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When Lindsay is running up the stairs with a bloody arm, she grabs onto a corner of the wall, but the blood was there before she touched it.
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When Lindsay is in the pool her hairstyle changes between shots.
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While the captives climb the spiral staircase, they are bleeding and pools of blood can be seen on many of the steps. However, a moment later when the camera shows a shot of Dr. Heiter at the top of the stairs looking down the hallway by the bedroom, there is not a drop of blood on the floor where the three had crawled.
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When Lindsay and Jenny are walking through the forest, one of them is holding a purse that constantly switches hands between shots.
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The front left tire of the girls' rental car blows out and is shown to be completely deflated, but in subsequent shots the tire is inflated normally.
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As Lindsay is dragging an unconscious Jenny through the yard trying to make an escape, you can spot the pink feather from the dart in her back before Dr. Heiter takes the shot.
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When the running Lindsay is trapped in a room, the blood she leaves on the door disappears then reappears.
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Crew or equipment visible 

When Lindsey is hiding in the doctor's bedroom and screams, "You're a sick man; you need help!" you can see a face move in the mirror behind her (which is definitely not hers because of the hair).
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Miscellaneous 

Though possible, the ingestion of human excrement would most likely have cause the individual to throw up, thus leading to the individual's demise as they would choke on their own vomit and the excrement.

Incorrectly regarded as goofs 

The phones in the house are not real phones, but they are connected to the doorbell as an intercom system. This is shown when Dr. Heiter answers the intercom, and it is the police at the door.
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Revealing mistakes 

When Dr. Heiter is taking an unconscious Katsuro out of his car, you see Katsuro "help" Heiter by putting his right arm on the door frame to push himself up, so Heiter can carry him.
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When the two girls realize they're lost in the woods, there are two scenes where the video is mirrored. This is evident from the car registration plates and the driver's seat which is on the right.
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When the two girls drive through the forest, you see at the license plate that one sequence is actually mirrored.
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When the human centipede is being trained to fetch the newspaper, Lindsay can be seen flexing and extending her legs despite having the tendons of her knee cut to prevent this.
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Spoilers

The goof item below may give away important plot points.

Revealing mistakes 

(at around 51 mins) Where three are in the cage and one of the women reaches to hold her friend's hand, the camera pans to the side. Here, Lindsay is clearly not connected rectum to mouth--her lips are visible with a gap of light between them and Katsuro's butt. Again this is visible in the pool scene and after Katsuro stabs the doctor's feet.
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See also

Trivia | Crazy Credits | Quotes | Alternate Versions | Connections | Soundtracks

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