The first four minutes [the credits], so you can say "Oh, I saw part of the movie..." Warning [re the embedded clip] for being explicitly boring.
Some notes re the movie:
The film's popularity helped launch a brief period of upper-middle class interest in explicit pornography referred to by Ralph Blumenthal of The New York Times as "porno chic". Several mainstream celebrities admitted to having seen Deep Throat, including Truman Capote, Jack Nicholson and Johnny Carson. Barbara Walters mentions having seen the film in her autobiography, Audition.Found in the list of 16 Movies Banned in America, via Neatorama's Upcoming Queue.
The production cost [was] $22,500 + $25,000 additional for music... Estimates of the film's total revenues have varied widely: numbers as high as $600 million have been cited, which would make Deep Throat one of the highest grossing films of all time... many theaters that screened the film were mob-connected enterprises which probably also "inflated box office receipts as a way of laundering income from drugs and prostitution" and other illegal mob-connected activities...
On February 23, 2008, Dutch public broadcasting corporations VPRO and BNN screened Deep Throat on national television... The film holds the record for the longest theatrical run of any movie in Portland, Oregon, shown daily at the Aladdin Theatre from 1975 to 1991.