Factual error: When Rain shoots the Xenomorphs in zero gravity, their blood forms long ribbons and other splatter-type patterns. In reality, due to surface tension, liquid in zero gravity forms into spheres. The blood would not have remained 'stretched out' like it does.
Factual error: Andy explains that the facehuggers "see" by reading body heat. His plan is to raise the ambient temperature of the room to body heat levels so our heroes are invisible. This would not work. If the temperature of the room was at body heat levels, the human body would generate heat faster than it could expel it, which would cause the body temperature to slowly rise. Our heroes should still be visible to the facehuggers, if not more so than before.
