Mistakes
When Ash attacks Ripley and Parker beats him off, the android gets up again and tackles Parker. Look closely as Parker crawls up against the wall...the body of Ash isn't a body at all...it's half a mannequin that doesn't even have a lower body connected to it, and it is visible when Parker's legs spread and you can see that there is nothing under Ash's torso except a big hole where the lower half should connect. See more...
Trivia
Originally the design for the alien called for it to have pulsing brains in its head (the idea being so we could see the creature 'thinking' while it moved around). The effects department accomplished this by having live maggots placed underneath the transparent dome on the head. Unfortunately the maggots refused to wriggle and move around on command, so the effects dept. doused them with LSD right before the cameras started rolling. The idea was later scrapped. See more...
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When Kane is struggling on the table shortly before the alien rips through his chest, just before the first patch of blood appears, his T-shirt rides up and something strapped to his chest can be seen. This is some sort of pack containing fake blood that discharges onto his T-shirt. (Best viewed in slow motion.)
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Picture submitted by Chaz1003
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