Aliens (1986)

Revealing: When Newt is sliding across the grated floor, Bishop reaches out to save her and you can clearly see he's standing in a hole to make him look cut in half.

Continuity: 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.

Continuity: When the Marines first enter the reactor room, the "Mission Time" readout on the shoulder mounted cameras jumps backwards and forwards in time with every cut.

As Ripley is getting out of the atmosphere plant at the end of the film, there's a countdown. If you time it, you find that the plant blows up about a minute and a half ahead of schedule, a pleasant change from the usual direction artistic time works in the movies. [There was a deleted scene from Ripley's solo journey down into the hive where she finds Burke still alive, but knows he's been impregnated and is going to die. After a short conversation, he asks her for a grenade, which Ripley hands her, and as she walks away, Burke pushes the primer on the grenade and kills himself. This could allot for the extra 1-1/2 minutes that was "lost" from the countdown timelimit. The scene was filmed, but not implemented in any release of Aliens, extended or not. Check it out at the very bottom here: http://www.planetavp.com/al/Aliens/DeletedScenes/]

The name 'Sulaco' was taken from a novel by Joseph Conrad. The name of the novel? 'Nostromo' of course.

To make the Aliens' blood smoke and burn, the SFX department came up with an idea to put two separate chemicals side by side in bags inside the Alien puppets, on top of the explosives. When the two chemicals mixed together, it created a nasty, acidic burning affect.