Corrected entry: In the other alien movies the chestburster's head is not yet formed the way the warriors' heads are, yet the chestburster from the dog (or, in the director's cut, the ox) has its head shaped like the warriors' heads, not the heads of the chestbursters seen in the other movies.
Corrected entry: Early in the film, Ripley asks Clemens to get her a "computer with audio capabilities". He replies that they've got nothing like that in the prison. However, later during the big chase sequence through the tunnels, we repeatedly hear a computer voice giving out audio information when doors are opened and closed (such as "Door B, Channel 7, safe" etc.).
Corrected entry: At the end of Alien 3, just before the credits, (I don't know if this is in the Special Edition), inside the EEV there's a recording of Ripley saying that she is the last survivor of the Nostromo, and that all the crew are dead. How can this be if the Escape Ship from the Nostromo and the Escape Ship from the Suloco are completely different ships.
Corrected entry: Something to note about the "dog" alien. Not only does it run around on all fours, and as Ripley says "it's different then the others", in one scene it does in fact act like an adolescent dog. I'm not trying to be vulgar or anything like that, but in the scene where they are leading the alien around, it has killed someone. It looks like it's eating that person, but what it's really doing is gyrating...it has mounted the person the same way a young dog will mount a pillow and "go to town."
Corrected entry: What happened to the dude in the straightjacket in the infirmary? After Ripley finished talking to 'glorified toaster' Bishop, Prisoner Golic is carried into the infirmary in a straightjacket, accused of killing his prison mates. A few scenes later, when Ripley is talking with Clemens and the alien takes him out, Ripley runs to the mess hall where the meeting takes place and of course, Andrews gets taken out. You never see Golic again.
Corrected entry: This mistake is slightly different from how the eggs actually got onto the Sulaco (that mistake was already addressed in another post). In all other movies, the eggs were 'hatched' by some sort of movement or trigger. Since what was left of the crew was in stasis, they were completely motionless and would not have triggered the egg to open up.
Corrected entry: As one of the crew members clocks Bishop II around the head with some sort of sledgehammer, the men clad in white shoot this guy, and he hurls himself off a platform. Watch the position, and slow down if neccesary in which way he falls. He fell forwards onto the floor below, which means he would have hit the floor face down. However, in the next scene, he is seen to be face up.
Corrected entry: In both the theatrical and director's cut versions of the movie, right before Murphy gets killed in the vents, he calls out to the dog "Spike". Because in the theatrical version the alien incubated inside the dog, Murphy mistakes the alien for the dog. However, in the director's cut, the alien incubates inside an ox instead of the dog, but Murphy still calls out to Spike even though the dog doesn't even exist in this version of the movie.
Corrected entry: After Clemen's death, there is a shot of the ventilation shaft into which he was dragged by the alien. However, the shaft seen is the one in which Andrew's is taken into by the alien later. You can tell the difference because of the ceiling colour and the design of the ventilation shaft.
Corrected entry: They try to kill the alien by covering it in molten lead. Lead is one of the heaviest elements we know about. Unless the alien and the guy it was eviscerating were made of a denser material than lead (unlikely, since we see it cling to flimsy ceilings etc) both the alien and its prey would have bubbled to the top of the lead, much as a balloon would rise to the surface in a swimming pool.
Corrected entry: Ripley is convinced that she is carrying an alien queen inside her. It appears to come out of a normal egg and when it bursts out of her chest, it has a normal smooth shaped head. Shouldn't the alien queen have have come from a bigger pod and have a jagged head like the adult version does, or at least a little stump where the big head grows out from so people will know it's a queen?
Corrected entry: At the start of the film we see acid being spilled on the ground on the Sulaco and acid burns on Newt's cryochamber, but there is only supposed to be a facehugger on the ship. Facehuggers only have acid for blood, it has no other forms of defence, so how did it burn the floor of the Sulaco to start the fire, and how did it burn into Newt's cryochaber?