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Leonardo DiCaprio and Toby Maguire were the first candidates for Sam. But in the end it was not possible due to the schedule and pay.
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The film chose to shoot in a valley in Southern California, a place very similar to the desert regions of the United States and Iraq. Some shots were taken in Mexico. The Marines did train in the local town of Brawley.
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"Fuck" is said 278 times in the film.
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Christian Bale and Joshua Jackson were both candidates to play Swarford.
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Gary Oldman, Kurt Russell and Michael Keaton have all been candidates to play Lieutenant Colonel Kasinski.
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The "Apocalypse Now" watched by the military in the film was edited by Walter Murch, the editor of "Bowl Head".
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Travis Aaron was the candidate to play Troy.
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Ivan Finyong claimed that 70% of his performances in the film were eventually cut. Two months before the film’s release, the director informed him that the producer did not want most of his dialogue.
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Jack Gyllenhaal's nosebleed was added by digital technology in post-production.
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All the sex scenes in the film were shot in one day.
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Photographer Roger Diggens personally operated the camera stabilizer in some of the shots.
Jarhead behind the scenes gags
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Fergus: [after seeing pictures of Swofford's girlfriend in his USMC shirt] She have her own clothes?
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Anthony 'Swoff' Swofford: [voice over narration] Suggested techniques for the Marine to use in the avoidance of boredom and loneliness: Masturbation. Rereading of letters from unfaithful wives and girlfriends. Cleaning your rifle. Further masturbation. Rewiring Walkman. Arguing about religion and meaning of life. Discussing in detail, every woman the Marine has ever fucked. Debating differences, such as Cuban vs. Mexican, Harleys vs. Hondas, left- vs. right-handed masturbation. Further cleaning of rifle. Studying of Filipino mail order bride catalog. Further masturbation. Planning of Marine's first meal on return home. Imagining what the Marine's girlfriend and her man Jody are doing in the hay, or in the alley, or in a hotel bed.