I don't think anyone has mentioned
RATED X (2000).
This Showtime film, directed by Emilio Estavez about the infamous Mitchell
Bros. (Behind the Green Door), features Peter Bogdanovich as a particularly
nasty example of a film professor, who berates Jim Mitchell (at San Francisco
State?) for producing pornography, rather than art. In point of fact,
Mitchell's film is - from what we see- a typical 60s hippie film with a girl
dancing topless in a park.
Screen-L is sponsored by the Telecommunication & Film Dept., the
University of Alabama: http://www.tcf.ua.edu