Apparently, Frank Zappa makes a short appearance in the 2008 movie / documentary "The Wrecking Crew".
The Wrecking Crew is a 2008 American documentary film directed by Denny Tedesco. It covers the story of the Los Angeles-based group of session musicians known as the Wrecking Crew, famed for having played on numerous hit recordings throughout the 1960s. The film premiered at the 2008 South by Southwest Film Festival.
The movie got a screening on Belgian national tv a little while ago.
-- info: Jan van Kemenade