The original script called for Leo Kessler to wrestle Warren Stacy to the ground in their final confrontation but Charles Bronson wasn't getting that "up close and personal" with a naked man.
The film was made in 1982, two years before DNA started to be used in criminal investigations.
Charles Bronson, 61 at the time, had plastic surgery in order to make himself look young enough to play Leo Kessler.
Playboy Playmate Jeana Keough said she was really upset when Charles Bronson's told her during filming that he had wanted her to play his daughter, but the filmmakers told him she was too tall. In reality, she was 5'7", the same height as the actress they did cast, but she had lied about her height on her Playboy modeling profile saying she was 5'9". That lie cost her a much better role.
The picture "did good but short-lived business" according to the June 1983 edition of "Box Office"