As I've said before, I actually watched Troll 2 back when I was like nine or ten years old. I liked the original Troll movie, and was expecting an actual sequel. I remember, even at that young age, my friends and I mocking how ridiculously stupid that movie was. I own the Troll/Troll 2 double feature DVD now as an adult.
This documentary is awesome. It's funny how it contrasts the Alex City natives (where the lead actor now lives and works as a dentist) who have never heard of this movie and could give a flying fuck, with the insane cult popularity it has in major cities. The dude's a living legend to these fans in LA, but then back home, people are like "Dude, shut up about your movie already", and you can tell they really don't believe him when he talks about the fanfare it receives outside of Alabama.
My favorite line was when one of the fans tried to describe Troll 2 as "what would happen if aliens watched a whole bunch of our movies and then tried to make a movie that humans would like."
This is the best description I've heard yet of Troll 2, that comes the closest to describing how weird and unnatural the story and dialog are.
I recommend both of these movies for different reasons.