Underworld settings in the USA featured in the movie included Skid Row in Los Angeles and Little Italy and Spanish Harlem in New York City.
In the novel, the main character is called Derek Torry, not Lou, and the entire story is set in the UK.
The unsettling poster Bronson's character has in his apartment is a detail from "Saturn Devouring His Son" a painting by Spanish artist Francisco Goya.
The name of the reclusive hippie monastic religious commune in Carmel in California, USA was the "Ashram of the Circulating Light".
This violent cop movie was released just over 18 months after Clint Eastwood's violent cop movie, Dirty Harry (1971). The tagline on this picture's main American movie poster and DVD reads: "This cop plays dirty!". Roger Ebert said that this film was " . . . probably the best violent big-city police movie since 'Dirty Harry'" and "Digital Retribution" said that this movie " . . . is very much a post-'Dirty Harry' genre flick and Bronson's [Detective] Torrey reflects that in spades."
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