
At 124 mins, this is the longest of all the films in the Dirty Harry series.
When Clint Eastwood approached Don Siegel to offer him the directing job for Dirty Harry (1971), Eastwood gave Siegel four drafts of the sсript, one of which was written by Terrence Malick.
In Malick's sсript, he changed the killer from being a mindless psychopath killing because he likes it, to being a vigilante who killed wealthy criminals who'd escaped justice.
Siegel didn't like Malick's sсript, but Eastwood did. Malick's ideas formed the basis for Magnum Force, the second film in the Dirty Harry series.
According to writer John Milius, the reason the sex scene with the Asian woman "Sunny" (Adele Yoshioka) is in the sсript is because Clint Eastwood received many fan letters from Asian women that contained sexual propositions.
According to Clint Eastwood biographer Marc Eliot the addition of a black partner Early Smith was a "conscious attempt by Warner to ameliorate the outrage that the punk in the 'Do you feel lucky?' scene in 'Dirty Harry' was black."
As with the first Dirty Harry (1971) movie, Clint Eastwood performs all his own stunts. His face is clearly visible in several stunt sequences which includes him clinging to the hood of Palancio's moving and swerving car, and the climactic motorcycle chase sequence.
Actor 'Mitch Ryan' plays a character who gets killed during the film. The day his death scene was scheduled to shoot, Ryan was ill.
He brought a doctor's note that read Ryan was "too sick to die" that day.