Trivia
Many scenes were filmed in Portland, Oregon because they needed rain. Unfortunately, during the weeks they were filming, it didn't rain in Portland.
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Benicio Del Toro broke his wrist while filming a fight scene with Tommy Lee Jones, halting production for four months and pushing back the release date.
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Both Aaron and L.T. use a form of martial arts called Sayoc Kali which is mostly knife fighting, and originated in the Philippines.
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The knife used by Hallam (Benicio Del Toro) throughout most of the movie is a Beck Wilderness Survival Knife, designed by Tom Brown Jr. (a tracker/survival expert who was a technical advisor on this feature) and constructed by David Beck.
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The Metro Area Express (MAX) light rail train used on the Hawthorne Bridge scene was actually two articulated buses joined together at the rear ends, with the frontal portion of the "train" to look like the actual older Bombadier MAX trains.
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Throughout the film both Tommy Lee Jones and Benicio Del Toro wear custom made buffalo leather moccasins by Catskill Mountain Moccasins of Woodstock, New York.
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A few of the characters have been given surnames of famous rock musicians: Bonham (John Bonham, Led Zeppelin), Kravitz (Lenny Kravitz), Van Zandt (Steven Van Zandt), Zander (Robin Zander, Cheap Trick), Powell (Cozy Powell) and Richards (Keith Richards, The Rolling Stones).
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The Portland skate park featured in the final race is Burnside, the same park used in Tony Hawk's Pro Skater game.
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Tommy Lee Jones' character is based on a the real life tracker/survival expert Tom Brown Jr., who was also a technical advisor on the movie.
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In the scene where Agent Hewitt hands Van Zandt a letter demanding Hallams release. The letter is signed by Attorney General Scott A. Anderson. Scott M. Anderson was the assistant property master for the film.
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When Hallam tells Bonham the men he killed weren't hunters, "they were sweepers", he means he thinks they were sent to kill ("sweep") him. William Friedkin says on the DVD audio commentary that it's left ambiguous whether that is true.
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Last film role of Johnny Cash. He performed the opening and closing narration lines, and the closing song.
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William Friedkin claims that the knife used in the climactic fight was the same one seen carved on-camera by Benicio Del Toro.
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