This film is based on Lee Child's 2005 novel One Shot.
Tom Cruise did all his stunt driving on his own.
In a scene where Jack Reacher's car crashes into some barrels, the car accidentally stalled upon the impact, but Tom Cruise was luckily able to restart the car before driving off again. Rather than do a retake, Christopher McQuarrie decided to leave it in the film, as he felt it added to the suspense of the scene.
Martin Cash (Robert Duvall) is seen using empty .38 special cartridge cases as ear plugs. This goes back to the 1950s. Since he was an old timer, he would have done this.
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