5. Alien – I guess we can cut this film some slack because it definitely had a lot going on. But the 1979 sci-fi thriller starring Sigourney Weaver wasn’t without fault. Just take a closer look at the scene where the alien removes Kane’s helmet. Kane is actually wearing a beige leather hood inside his space suit on LV-426, but when his helmet is ripped off aboard the Nostromo, the hood vanishes.
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