No computer special effects were used in the film, and Thomas Jane personally completed 90% of the special effects shots.
When filming the explosion scene in front of the Bank of America building, because the crew did not make an announcement, hundreds of people called 911 to the police.
In order to shoot the film, the producer ordered 5 Pontiac GTOs.
When Rebecca Romijn was filming a scene where the wound was sewn, he penetrated the fake wound because of the needle being inserted too deeply.
In order to make the background of the story suitable for the modern era, the Vietnam War in Frank Custer's military resume was changed to the Gulf War.
A minor plot in the film was later deleted. Frank Custer discovered that his friend and FBI colleague Jimmy Vickers had leaked his information to Howard Center. Custer later found Vickers and Killed him and pretended to be the scene of the suicide.
In order to reach the goal of 8% fat content, Jane followed a strict sugar-free diet for 4 weeks. As the shooting date approached, Jane began to consume liquid food and kept eating only one solid meal a day during the shooting.
When filming a fighting scene, Thomas Jane stabbed Kevin Nash.
