1.  Danny McBride acting like an obnoxious hillbilly.
  2. At least three characters say, “What the Hell is that?!”
  3.  Once face huggers are discovered, no one things of putting on a helmet for the rest of the movie.
  4.  Someone gets super hungry in a cafeteria scene.
  5.  No one turns on the damned lights.
  6.  The android betrays everyone.
  7.  Giant space eggs that no one immediately says, “Hey, get away from those.”
  8.  A scene where an alien gets disturbing close to a protagonist.
  9.  Someone firing a space machine gun inside a spaceship without regard for decompression.
  10.  People in the movie theater remembering that they already saw this movie at least twice.