 Interiors were completed at MGM British Studios, Borehamwood near London.At the same time, MGM was filming Graham Greene's "The Comedians" (1967) in Africa, though the original took place in the Caribbean.In the German version, Curry was renamed Willy Krüger and was portrayed as a former Wehrmacht officer who had already clashed with Henlein during World War II because of the latter's fanatical Nazism.