The Auriga is a science vessel, but it is under military jurisdiction, run by soldiers specifically to control the aliens in the event of a breakout. When the aliens get loose, why do all the soldiers evacuate instead of fighting the aliens? As military personnel, they would have contingency plans in place for this sort of occurrence - US military strategists are ridiculously overprepared with worst-case scenarios that often have heavy costs involved, but mean that the military will never be so paralyzed that it just runs away. The Auriga should have a plan to fortify a single location or at least blow up the ship in the event of a mass breakout. [The commanding officer sounded the evacuation alarm. The soldiers were simply following orders. He got them off the ship, then destroyed the escape ship, to keep the secret of the aliens.] Corrected by MovieGuy

The scientists claim they procured blood samples on the Prison colony that allowed them to recreate Ripley. If you used blood to clone Ripley, then you'd get a clone of Ripley without a chest-burster inside her. The chestburster doesn't alter DNA. [1) I don't recall any DNA blood tests being given in any of the previous movies, so you don't really know if the chest burster does or does not alter the DNA in any way. 2) In an inscet colony, any egg laid has the potential to be a queen. When a new queen is needed, certain eggs are treated differently to produce a queen instead of a worker. Since Ripley was implanted by a queen, maybe the intent was to produce another queen and who knows what happens to a person's DNA implanted with a queen.] Corrected by Rlvlk

In the cafeteria scene, Wren refers to "the company" as "Weyland-Utanic" when the correct name is "Weyland Yutani", as seen and stated in the previous alien films. [Having listened to the scene, it sounds like he says the name correctly. Even if he doesn't quite get it right, considering that Weyland Yutani has apparently been dead and gone for a considerable number of years, it's not unreasonable that he might get the name slightly wrong.] Corrected by Tailkinker

During the entire battle scene on the ladder, DeStephano is nowhere to be seen. Considering the fact that he has a gun, he could have helped out when the alien was attacking Christie, but instead he curiously disappears from the scene, until Call opens the door, and he is at the top of the ladder. [He is not a nice person. He is more interested in getting away than in helping.]

Once the baby alien has been sucked out of the window they appear to be flying through a pretty shot of sunlit clouds. This would mean that they had reached the upper level of the troposphere at least (approximately 15 miles depending upon whereabouts on the planet they were and what the current barometric conditions were).  Therefore there are two things wrong (1) Firstly the depressurisation that sucked the alien baby out would continue just as if a whole had been made in a jetliner. Ripley and Call would therefore still have to hold on.  (2) Secondly the temperature at the top of the troposphere is about -60 degrees Fahrenheit. All moisture would freeze instantly, whereas they stand there having a chit chat as if they were on the deck of cruise liner. [1) Depressurisation would end as soon as they ran out of air. 2) That -60 degrees neither freezes things instantly, nor would even do so quickly as it would have to come in through the small hole made, as the ship is (minus the hole) sealed and insulated from the outside. One's an andriod, the other's half alien, I don't see any problems here.] Corrected by James King III

In the cargo hold of the Betty, when we first see the guy in the wheelchair, the camera starts from his legs which are strapped down and pans along to his body. If you watch carefully you see his right leg move although he is supposed to be paralyzed from the waist down. [Many people with paralyzed limbs experience twitching and spasms. Voluntary and involuntary movement of the muscles are carried out by 2 different branches of nerves, dorsal root nerves and ventral root nerves. If only the dorsal root nerves are damaged the ventral root nerves can still cause involuntary reactions to stimulas. Which means that while the person cannot move the limb when they want to, pain or other stimulas can cause the limb to twitch or jerk.]

Why did the two aliens gang up and kill the third one to escape the holding cell? Later in the movie, it is established that these mutated aliens can apparently regurgitate their own acid blood as a weapon, so slaughtering the other alien wasn't really necessary; they all could've just vomited some acid on the glass or the floor and gotten free without dwindling their numbers. [It took a lot of acid blood to burn a hole in the floor, and vomitting produces little amounts - just enough to hurt an enemy. It's not really a mistake - the aliens did it the faster and more reliable way.] Corrected by Grigory the Wanderer

After the newborn is sucked out the Betty enters the atmosphere of the earth. You see the hull gets hot and red. Somehow Ripley and Call manage to survive the ride through the atmosphere - in a room with a broken window. Remember the reason of the "Columbia disaster" ... [The fire entering the room would have destroyed a current-day space shuttle, but the movie is set in the future, so they have more resistant ships.]

At the end of the film Ripley uses her acidic blood to burn a hole in the ships glass window the problem is, as any High School Chemistry student will know, acid doesn't react with glass. [The acidic blood of the Aliens is never scientifically described onscreen, only compared to highly acidic substances. Because this is an alien biology, it could have an acid-like caustic effect without actually composing what a chemist would describe as an acid. For example, the blood could contain omnivorous microorganisms that consume substances other than the Aliens - it's possible that these could destroy glass as acid does not.]

When Ripley asked the doctor how they "got" her, he replies from blood samples on Fury 16. This is in reference to the planet in Alien 3, but it was called Fury 161. [Alien Resurrection takes place 200 years after Alien 3. I don't think a lot of people would remember (or care) precise details about an abandoned prison colony world.]

For some strange reason, in every close up shot of the actors there is a white ring around the pupil of the eyes. My guess is the camera reflection. It noticablely stays in the same position whenever they duck their heads down. [This is a deliberate, and relatively common, effect created by the lighting. It involves shooting the relevant shots through a ring of lights to give the 'hoop' of illumination in the eyes of the actors, as mentioned in the DVD commentary of the film.]

When the female scientist is showing Ripley pictures to see if she could identify them, there is a bad editing mistake. When the scientist shows Ripley the glove, she seems to silently mouth the words "Close....glove." This occurs before Ripley identifies the picture as "Hand", to which the scientist actually says "Close...glove." It seems that the shot was recycled and very poorly edited. [She isn't mouthing the words close... glove. She is mouthing Glove to hint to Ripley what to say.]

Something to note as the flesh alien is being sucked out of the Betty. In the previous films, the drones were designated as Xenophobes or Xenomorphs (skeleton on the outside), very similar to insects. When the flesh alien dies, the last thing we see is a nearly human SKULL. [An animal with its skeleton on the outside is actually called an arthropod. A Xenophobe is the fear of strangers or foreigners and a xenomorph is a species where the young do not resemble the adult form (e.g. caterpillar and butterfly, or face-huggers and insect-like drones).]

Supposedly, the new Queen removed from Ripley is the only vector for recreating the Alien line: Perez is told that the Queen will begin producing eggs in a few days. But at the end of the movie, we find that the Queen is now using a reproductive system based on humans, giving birth to live young rather than laying eggs. If the scientists could salvage eggs from another site, why would they bother cloning Ripley? [In the script for the film it is revealed that the Alien Queen was able to produce eggs AND give birth to live young, as a result of the cloning process. The eggs the Queen produced for the first batch of hosts probably were created and stored before the hosts arrived. The reference to laying eggs was probably for the second batch of eggs to be laid, as the scientists planned to make as many aliens as possible, and were waiting on other batches of human cargo to arrive for them to impregnate.]

Why do the scientists bother to kidnap 12 humans to host the aliens? It seems it was quite difficult to obtain the human hosts in secrecy. In Alien 3 the Xenomorph grows inside a dog (or an ox in the directors cut version), and in the first movie it has grown inside an unidentified alien species. Surely it can not only grow inside humans. Scientists more than 300 years from now who are able to clone adult individuals would have thought of this. They could just have used monkeys, cows, pigs… [Aliens pick up DNA from their hosts - remember the dog/alien from 'Alien 3'. The scientists want alien/human hybrids, not anything else.]

After Ripley kills the first alien, Wren tells them that there are twelve more. Now, compare how may aliens there are. Altogether there are thirteen aliens. Take away the queen and all the other aliens that were killed (with the exception of the Newborn) and you have 8. But when Ripley is taken through the floor, I saw eight. You can see the head very briefly as it zooms in. Shouldn't there only be seven drones? [When Ripley falls through the floor, its just a mass of hive gunk. There are many strange formations in the hive resin itself that look like aliens, but are not actually aliens. Think back to the second film when the marines couldn't spot a single alien, since they were all blended in with the hive. It is purposely created that way so that the creatures can blend into it. And besides, there don't appear to be more than 3 or 4 aliens there anyway, other than the one alien that is dragging Ripley down into the hive.]

When the crew of the Betty gets through the kitchen and into the egg trap, the eggs begin making monster sounds when they open, such as growls and groans. The eggs aren't alive, and in all previous movies the facehuggers never made any sounds. [The eggs slurp and the facehuggers hiss a little bit. This is consistent with the previous films.]

When the guy in the wheel chair shoots the alien above him, it drips blood on him and yet this blood which earlier in the film was capable of buring through the floor barely marks him. [Reactions of acids with metals and organic materials do occur at different rates; what is shown in the film is realistic. Note too that Vriess' clothes (he's the mechanic) and skin are oily, which will also help slow down contact between the acid and more delicate organic molecules.]

When Gediman is rambling about the queen's new 'perfect mutation', he fails to realize how imperfect it actually is when compared to its normal state. Instead of cranking out hundreds of eggs in a short amount of time which can lead to a huge army being built in a matter of months, now the queen has to spend countless hours straining and suffering while trying to force out an awkward, bumbling monster that attacks her on sight. Hardly a situation that I would describe as 'perfect'. [Gediman obviously does not consider the relatively low birth-rate to be important, the mutation is perfect by his personal criteria. Others may disagree with his opinion, but it is (at most) an error on the part of the character, not a movie mistake.]

When the crew first meets Purvis, the guy with the alien inside him, Ripley explains to what the thing is. If you look over her left shoulder during this you can see a crew member moving around and eventually ducking behind a counter. [That's not a crewmember - it's Johner (Ron Perlman)] Corrected by Chimera