Corrected entry: After they escape the planet, the nuke goes off, and they are back on the spaceship, where they should all be weightless, including the alien, and would be floating around on the ship, not walking around like they were on solid ground. This totally unscientific approach to the movie is annoying.
Corrected entry: If you damage a fusion reactor, it doesn't explode with a thermonuclear effect. It just shuts off.
Corrected entry: There is NO WAY that the entire crew of a Marine Transport is composed of two squads. When the Marines all go down to the surface, it's ALL the Marines, resulting in having to remote pilot the second landing craft down. As someone with over 20 years experience in the Military, I can safely say that this vessel would have a crew that would include -among others- a pilot, copilot, navigator, engineer, communications officer, medic, and several crew members to maintain the food and life support systems, various cargo loaders, drop ships, and weapons systems of the ship (which are visible in exterior shots). There is no way that a bunch of Privates would be qualified to do those tasks- their Military Occupation Specialties are 0300 series/combat related NOT support related. Those are apples and oranges.
Corrected entry: It would have been impossible for the aliens to produce such a large army because of a limited number of hosts that can produce them. There was no indiginous life on the planet so there should only be as many aliens as there was colonists on the planet, which is about 150. It doesn't matter how many eggs the queen lays, they must have hosts to produce the alien creatures.
Corrected entry: The little girl Newt is taken and cocooned by the mother alien. Why, then is she rescued? All the other cocooned victims have been impregnated and are incubating baby aliens. Yet Ripley brings the child back in the almost certain likelihood that 24 hours after the credits have rolled, little Newt's stomach will explode.
Corrected entry: During the escape of Ripley and the marines from Sub Level 3, an alien lands on the APC, and smashes the window trying to get to Ripley. She brakes, then drives over the alien. Not only does the alien's acid blood do nothing in this scene, the next shot of the APC has the window intact.
Corrected entry: When Ripley and Hicks are discussing their defence plans after the first encounter, they decide to put one of the auto guns in each of three locations, leaving one left over. When we see the guns in place they have actually used two guns in each of two locations, that is, two pairs.
Corrected entry: At the end, when Ripley has her arm slung through that rung in the airlock and the queen alien is hanging from her foot AND the decompression that has everything in the cargo hold whipping by her head...she only loses a shoe as the queen is swept into space? By all rights, shouldn't only her arm be left dangling there? (02:11:25)
Corrected entry: In the scene where everyone decides to leave and nuke the site from orbit, where was Bishop? He was last seen in the Med Lab studying one of the face-huggers. Yet he was nowhere to be found when everyone decided to leave, when everyone was outside, or when the ship crashed. Then, he's suddenly back saying that he'd check on Lt. Gorman and continue his research back in the Med Lab. Come to think of it, where was Lt. Gorman in all of this too? He was last seen getting knocked out-cold. Nobody was carrying him or helping him in any of those same scenes. Were they just going to leave him and Bishop in the Med Lab while they nuked the site from orbit?
Corrected entry: Given Bishop's crucial role in saving the day throughout Aliens, doesn't it seem odd that human marines are used at all in the future? He's smarter, tougher, has quicker reflexes and can be mass-produced, as Alien 3 will testify. And considering the corporate scam being played out, you'd think they'd be more careful than to send in soldiers when they could have simply made a dozen androids to assist Ripley - who could still play host to an alien foetus.
Corrected entry: It's true that the queen was going to use the elevator to follow Ripley and Newt as they were trying to escape. But, how would she know where the elevator stopped? It's not like there's only two levels. More so, she would have to hit the button before the first elevator even stopped to follow them up as quickly as it did. Either way, she shouldn't have been able to know where they get off and wind up on the exact same floor as Ripley and Newt.
Corrected entry: in the extended version especially, the fact that Ripley was lost in space for almost 60 years and at the exact time when she arrives on earth the colonists find the eggs and the company loses connection to them is an unbelievably huge coincidence. In the theatrical version the timing of the events remains a bit more unclear - the colonists may have died even years ago, at any time between those 57 years time period and the company noticed that after they found Ripley and decided to communicate with them to check. But in the extended version this possibility is killed as we see the colonists' situation, and one just has to believe the above described huge coincidence.
Corrected entry: Not really a HUGE mistake, but when Ripley finds Newt in her hole the first time you can see lots of boxes laying round with rations or MRE's in them. But later when the female medic is checking her out she says she is suffering from "Borderline Malnutrition" How is that possible when she had so much left over food?