- The French title for the movie is "Le Port de la Drogue" ("The Drugs Port"). The film is clearly about espionage, butin the French version the title was changed, and even the dialogue referring to the spying was completely replaced by dialogue about drug dealing.
- Shot in 20 days.
- In the opening scene on the subway, a soldier who leaves the train is shown wearing the "Big Red One" First Infantry Division shoulder patch. Director Samuel Fuller fought with the First Infantry during World War II, and later made a film about it (The Big Red One).
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