Sacha Gervasi, the director of the movie came out and told the story of his involvement with the guys from Anvil. From the movie's wiki page: "Gervasi first met Anvil on September 21, 1982, after a gig at The Marquee Club in London, where he introduced himself to the band as "England's number-one Anvil fan." He subsequently became a roadie for the band on their '82, '84 and '85 tours, and was given the nickname "Teabag" by the band. He reunited with Anvil after a break of 20 years, and started shooting a documentary about them in November 2005." Awesome.
The show was fantastic - and we were extra excited because his guest visitor at the end of the show was Jonathan Ames (who is one of my favorite authors).