The film is noted for introducing the infamous MAC-10 submachine gun to the general public and creating a demand for it.
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.
The car chase finale was filmed on the Olympic Peninsula; there were filming delays when the beach was foggy.
Stuntman (and later director) Hal Needham designed the car chase at the end of this film. It featured the first staged rollover of a car in film history.
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.
Sneak previewed in Seattle, Washington, where the production was filmed, on 4 January 1974.
The hospital where the drug heist takes place is now the Seattle headquarters of Amazon.com.
This is the only movie that western-director John Sturges and cowboy-actor John Wayne made together.
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