Stupidity: In the first action scene where James Franco's body becomes mortally engulfed in flames in his cryopod, when they are using the jaws-of-life-hatch-removing tool to manually free him, there are two very strong men struggling with all their might to pull down on the levers to pop the lid off. A) If you watch closely, one of the guys is only using one hand to pull down on the lever. Hardly a serious effort to crank the thing open. B) Meanwhile, there are three other men present who, rather than jumping in with the other two guys trying desperately to pull those levers down, are instead ridiculously engaged in holding Franco's hysterical girlfriend back from the now-flaming pod. (00:10:00)
Stupidity: Despite landing on an alien planet which they have minimal information about, they just wander around with no protective equipment whatsoever. No face mask, no air filter, they're entirely unprepared for the prospect of anything bacterial/fungal which could do them harm. Even after people get sick others say "don't touch anything" without any concern that the cause might be airborne.
