At the Denver premiere of “Super Troopers 2” on Sunday, the giddy crowd inside the Sie FilmCenter was treated to not one but two surprises: a trio of cast members from the film’s creative team, the Broken Lizard comedy troupe, and some brief words from co-executive producers Kayvan Khalatbari and Andy Juett. The latter was particularly telling of the film’s stoner pedigree — which extends to its national premiere on April 20, a.k.a.