The line "You are one ugly m*****" that Lex delivers to the Alien when she kills it before the exit through the shaft, is the same that Major "Dutch" Schaeffer told to the Predator in the original "Predator" (1987) film. See more...
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Visible crew/equipment: During the briefing Weyland says "But it's not on the ice, it's two thousand feet below it" it cuts to a shot behind Maxwell with an overview shot of the crew. If you look behind Maxwell you can see the tip of a head moving into picture. In the previous shot we could see no one was standing behind Maxwell, and it couldn't be Sebastian cause he went back to his seat.
Continuity: When Lex and the predator are going up the tunnel at the near the end of the movie. Lex has the alien head shield on her left arm. But when they are speeding up the tunnel, the shield is not on either arm. If you pause it, you can see the shield missing. When they emerge out of the tunnel it is back on her arm.
Continuity: When Lex Miller and Sebastian are talking at the side of the ship at the beginning, Miller says "Ii wish you'd consider coming with us ", it cuts to a shot from the side/back, she is looking either in Sebastian's direction or out to sea, yet in the following shot she is looking at Miller's face.
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.
Factual error: When the predator starts to kill Weyland, Weyland uses his oxygen tank as a makeshift flame thrower. Contrary to popular belief, oxygen does NOT burn. It only allows other things to burn. The three things needed for a fire are oxygen (which he had), fuel (which he did NOT have) and heat (from the flare he lit).