A man is strapped into an electric chair and zapped twice after the first attempt fails to effectively kill him. Blood oozes from his eyes and foam spews from his mouth. This scene is possibly the most iconic, very grotesque but is fake.
Real footage from the Holocaust is shown. It's meant to be analytical rather than exploitative, but it's disturbing nonetheless.
Real footage of surgical procedures, autopsies, and corpses in various states, including mummified.
There is a lot of REAL footage of animal violence. The film shows footage from a slaughterhouse that contains methods of killing animals entirely outdated today, very bloody and gory. Also shown is footage of seal hunters clubbing seals, however there is not very much actual gore shown. A rooster's head is cut off by a farmer and we see the body bouncing around on the ground afterwards. A cow is punctured with a sharp object and people gather and drink the blood.
There is also very fake animal footage. Most famously is the monkey sequence. This sequence shows diners in a strange restaurant where they put a monkey in a cage and the diners beat in its head with mallets. Then the head is cut open and the diners eat the monkey's brains. Very gory. However, the commentary on the dvd version of the film admits that this sequence is fake.
An animal control man is snatched from a boat by a large crocodile. We see his mutilated remains as they are pulled out from the water. This is all shown as a newscast, there's lots of quick-cuts and lens-flares to cover up some of the action and a little of the aftermarh but this sequence is also fake.
A man videotaping a bear while his wife feeds it bread is attacked and mauled by the bear. This is also fake.
A man goes crazy and is shooting a gun from his house. When the man runs out on the front porch the police shoot him. This is seen in good detail, and the man is shot many times. Then the camera follows policemen as they go into the house and find the bloody bodies of the man's wife and children. This sequence, although looking the most realistic of the faked footage, is nevertheless fake.
A cult of people cut open a dead body and eat the internal organs. This footage is faked, and the director himself plays the cult leader.
A man catches on fire. It is uncertain if this footage was real or not.
A man is graphically executed in an electric chair. We see his face close up as he foams at the mouth. Blood then pours from under his eye bandages.
A man's head is cut off as a terrorist execution. This is also fake.
Many bloody train wreck and car accident victims are shown. All but one involving a movie stunt gone wrong is real footage.
A woman jumps from a building, we see her hit the ground, make a loud thud, screaming from traumatized onlookers and the cameraman runs up to her bleeding body. This is real video tape footage.