The thing about this movie is it has too much raunchy language and too many drug references for mainstream trailers to do it justice. It even has some violence (the inciting incident, no less) that's too graphic to hawk to people looking for a cool dumb stoner comedy. Until I saw the real-deal trailer at the official site I just didn't like this movie too much. Trailers were looking too labored on Apple, Yahoo, et al. I was thinking Judd Apatow (who produced) had run out of steam.
But when you're allowed to show drug references, along with the crude language, (and the inciting incident), without concern for who you might offend the trailer springs to life.
Right now this is looking like another hit for the Apatow/Rogen comedy express. This is 100% pure comedy -- no stems, seeds, political correctness, or any of that other shit. Don't waste your time with the watered-down trailers they're pushing around the web. Head over to Sony's crib for the real dope. (End of double entendres).