The movie - which features John Cleese, Eric Idle, Terry Jones and Michael Palin talking about Innes's contribution to Monty Python – receives its word premiere in Hollywood later this month.
Other contributers include Simpsons creator Matt Groening, singer-songwriter Aimee Mann and comedians Phill Jupitus and Emo Philips.
The film charts Innes's career from art school through The Bonzo Dog Dooh Dah Band, work with the Beatles, Monty Python and The Rutles, mixed with concert footage and animations.
Here’s a trailer for the film, which will open the American Cinematheque's ninth annual Mods & Rockers Film Festival at the Egyptian Theatre in Hollywood on June 26:
