Continuity: When Alexa and Sebastian are walking down a passageway in the pyramid, after everyone else has been killed, they begin to hear aliens all around them and look around. When Alexa shines her torch at an alien, she is on Sebastian's right side, but in the next shot she is on his left side, and her small torch vanishes from her right hand.

Continuity: In the beginning when Lex answers the phone, her earpiece and ear are visible. In the next shot both are covered by her cap.

Continuity: At the end compare the shots taken from the top when the predator is lying dead over the snow; right after he dies and when the other predators are going to pick him up. His left arm changes position and his "rasta locks" are spread in a different pattern.

Continuity: When Adele first puts the magazine in her pistol and holsters it, its a Beretta 92F. When she pulls it out in the sacrificial chamber, it has changed to a Beretta 84FS.

Continuity: In the close-up shot inside the snowmobile, where we see Sebastian fiddle with his bottle cap, we can see he is holding it with his right hand. When it cuts he is holding it with his left hand.

Continuity: In the beginning when Sebastian is uncovering the tunnel he says "We must be right on top of it", you can see he rests his right arm over the edge of the bricks. When it cuts from inside the tunnel his arm no longer over the bricks.

Factual error: The members of the expedition are wearing their Snow Goggles on their hats with the lenses to the front. However, anyone who has ever worked in a cold weather environment (especially the guide and her "7 seasons on the ice") would know that the goggles should be worn backwards if they're not over your eyes. This keeps them from getting moisture on them.

Continuity: When Miller and Lex see the penguin it travels some distance from the table it emerged from, yet in the following shot, it is a lot closer to the table.

Continuity: When Sebastian is checking the sand inside the tunnel, right before he finds the Pepsi Cola cap, you can see a close-up of his wrist and there is no sign of his watch. When it cuts his watch is visible.

Continuity: In the beginning, when the man notices the "Unidentified Heat Signature" warning on the screen, he removes his arm from the table twice in separate shots.

Continuity: When Sebastian says "Thomas, the burial chamber is here. We're gonna find it." you can see a man with a blue shirt and a man with an orange shirt walking in the background. When it cuts the same men are walking but now several people have suddenly appeared behind them.

Continuity: In the scene when the Predator is impaled on the Alien's tail, there is Predator blood all over the Alien's tail. When the Alien flings the Predator's body away, the Predator blood on the Alien's tail disappears.

Continuity: When the main Predator kills his first alien, he concludes the 'rite of passage' by burning himself on the forehead with alien acid. This should have left a circular mark on his forehead, but when we see him at the end of the movie, he only has the 'tau' symbol.

Continuity: When Lex and the Predator are running through the tunnel and neither of them has the spear that the Predator built for her. Then later spear is back. Then after the sled crashes, its gone again. For the remainder of the sequence, the Predator has it.

Factual error: When arriving in Antarctica, there is dialogue about the full moon (la luna di cacciatore, etc...) There is no full moon on 10/10/2004 in Antarctica. But it does look nice in the movie...

Continuity: When Sebastian starts to crawl back out of the hole after discovering the Pepsi-cola cap, the guy with the camera is holding the camera with his right hand, but in the following shot he is holding it with both hands.

Continuity: In the beginning when the man realizes the Predator is in the same room, he falls to the ground and backs up against an oven. You can see several dippers behind his back, but only three dippers on his right side. When it cuts to a close-up there are five dippers. (Extended version only).

Continuity: When the group walks along a passageway, the predators are watching from above, and in one shot the distance of the guy at the back of the group goes from about 8 feet, to almost right next to the others between shots.

Continuity: When Lex and the others in the group reach the sarcophagus, Sebastian starts to turn one of the dials, the camera cuts to Weyland for his line, he has a flashlight in his right hand, yet in the following shot its no longer there.

Continuity: When the alien queen awakes she opens her mouth and screams. When she does so she lifts up her upper lip exposing her teeth. When it cuts she does the same again.