In an early-'90s, and again in late 90's/ early 2000's, Spinal Tap tour, Michael McKean, Harry Shearer and Christopher Guest opened for themselves as The Folksmen and were booed during the first act, as people did not know or cared that the two bands had the same musicians.
Real-life folk musician Robyn Rosenkrantz (of the popular duo Bright Blue Gorilla) appears as an uncredited extra
According to an interview on NPR, a number of real folksingers from the '60s, including Arlo Guthrie, wanted to be in the movie, but the producers thought that would detract from the satire value and declined.
All of the songs were written by Eugene Levy, Christopher Guest and other actors in the cast who also played all their own instruments.
In September 2003, much of the cast did a brief tour. They appeared in character, recreating the "reunion concert" as seen at the end of the film.
Mickey's new husband is a model train enthusiast with only one train. This is because when the filmmakers went to the home which supposedly contained an impressive train setup, all of the trains themselves were broken or otherwise unusable. The engine seen moving in the movie is being pulled by dental floss through "Crabbe Town".
In addition to the four film cameras used to film the concert, a few TV cameras were used. They filmed the entire concert as it would have appeared on television.
The cover of Mitch and Mickey's record "Meet Mitch and Mickey" is a reference to the cover of "Meet the Beatles".
One of the Special Features of the DVD is footage of the concert in its entirety as it would have appeared if broadcast for TV.
John Michael Higgins wrote all of the vocal arrangements for The New Main Street Singers. Originally the group was going to be a nine-piece ensemble that sang in unison (everyone singing the same part) but it was decided to give Higgins free reign with it.
The Folksmen are a parody of The Kingston Trio, right down to some of the album covers, the uniforms, and the way they perform their songs.
According to an interview with Michael McKean's wife Annette O'Toole , the songs were written by her and McKean during a car journey to Vancouver from their home in LA. Planes were grounded following the terrorist attacks on the USA on 11 September 2001 and O'Toole had to get to Vancover to film her TV show "Smallville" (2001).