Continuity mistake: After Rain shoots all the xenomorphs in zero gravity, and she and Andy have to traverse through the floating blood splatter, the bodies of the dead xenomorphs have suddenly disappeared.
Continuity mistake: This film takes place after the events of "Alien." At the end of "Alien," the Nostromo is vaporized in a massive nuclear explosion, but in this film, massive chunks of it are found floating in space. Not to mention the fact that even if such giant pieces survived, they would have been propelled outward indefinitely and would not all be floating in the same confined area.