The Conspirators

This film has many tangential connections to Casablanca (1942) besides its plot line of anti-Nazi intrigue. It features Paul Henreid, Sydney Greenstreet and Peter Lorre, who all appeared in "Casablanca". Behind the scenes, the film features music by Max Steiner and cinematography by Arthur Edeson, who both worked on "Casablanca". Like "Casablanca", it was produced by Warner Bros. It also features Hedy Lamarr, who was originally considered for the role of "Ilsa", which was eventually played by Ingrid Bergman. Lamar had also previously appeared in Algiers (1938), which also had a plot line similar to "Casablanca". In "Casablanca" and this film the city of Lisbon is referenced as the port of departure for the United States and other points in the non-Axis world, moreover it is the main setting for this film.

Don Siegel was to have made his directorial debut with this film, but after a spat with Warner Bros. chief Jack L. Warner, he was "demoted" to assistant director and Jean Negulesco was assigned as director.

At the first shooting, the cop says the pistol is a "7.63 Luger". The Luger originated in Germany and was made in only two calibers: 7.65mm (.32 caliber) and 9mm (.38 caliber). There is however a 7.63 Mauser, which also originated in Germany and may have caused the confusion.

A song, "Orchard Moon" with music by Max Steiner and lyrics by Al Stillman was published in connection with the picture.

A modern source lists Marcel Dalio in the role of "Croupier," but the only croupier seen in the movie was Alphonse Martell.