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As The Dude writes the sixty-nine cent check at Ralph's, he watches George Bush give the "This aggression will not stand" press interview live on television. President Bush gave the interview on the White House lawn on Sunday, August 5, 1990, three days after the Iraqi Army invaded Kuwait. The Dude's check, however, is dated September 11, 1991, indicating that The Dude is so broke that he had to post-date a sixty-nine cent check by over one year.
In an interview with Rolling Stone Magazine, John Goodman stated that The Dude referring to The Big Lebowski as a "human paraquat" was one of the only improvised lines to make it into the final film. Virtually every other line, including every "man" and "dude," was scripted.
Before filming a scene, Jeff Bridges would frequently ask the Coen brothers "Did the Dude burn one on the way over?" If they said he had, he would rub his knuckles in his eyes before doing a take to make his eyes appear bloodshot.
A lot of the Dude's clothes in the movie were Jeff Bridges's own clothes, including his Jellies sandals, which he still owns and uses to this day.
While being a member of the Bowling team, the Dude is never seen bowling.
Asia Carrera: The girl appearing opposite Bunny Lebowski and the nihilist in the porno that Maude shows The Dude is a porn star.
Charlie Kaufman: In the audience during the interpretive dance scene. Kaufman's own script, Being John Malkovich (1999), also contains an interpretive dance sequence.