Critical Dissonance: Critics often didn't get it, but it was well received by the general public and continues to be so years after its release.
Diabolus ex Nihilo: The Super HotGiant Alien, on top of being something one wouldn't expect in a stoner comedy, really comes out of left field. The alien women just suddenly merge into this giant woman that devours Tommy, in a rather BLAM way to ( almost) kill off a character, and goes on a rampage.
Ho Yay: The scene where the two main characters actually make out solely to "beat" another driver in some sort of "bad ass" competition during a red light. No to mention when Chester said " I know your body." to Jesse.