- Movie Goof (revealing mistake): McQ uses an Ingram MAC-10 9mm machine pistol, which fires approximately 20 rounds per second. When firing the MAC-10 in the car, on the beach, no empty cartridges are ejected from the gun. Emptying a full 30 round magazine would have sprayed casings all over the car.
- Movie Goof (continuity error): After McQ shows Myra the balloons of cocaine in his handkerchief, and gets up from the chair, the balloons roll off the handkerchief and onto the floor. When he is rebuffed by Myra, and returns to the chair, the cocaine is back on the handkerchief and not on the floor.
- Although he had occasionally played sheriffs and law-men in his many Westerns, this was one of only two movies of John Wayne's career in which he played a cop.
- Although John Wayne claimed he made this movie because he regretted turning down Dirty Harry, it has been suggested that he was never actually offered the earlier movie due to his age.
View All: Trivia - Goofs - Quotes
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