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A November 1968 Daily Variety news item indicates that Robert Fryer was initially set to direct The Salzburg Connection. In March 1969, Hollywood Reporter items noted that Fryer had assigned Edward Anhalt to write the screenplay. A November 1971 Daily Variety items lists Jeremy Kemp in the cast. According to December 1971 ^LAHExam article, the lake called Finstersee in the Helen MacInnes novel and film was a fictionalized version of the Toplitzsee, located in the Salzsammergut, just east of Salzburg, Austria. According to the article, in the final days of the World War II, Nazis forced British and French prisoners of war to carry numerous sealed crates to the lake into which they threw the cargo. Eyewitness accounts indicated that as many as seventy crates were dumped into the Toplitzsee, and in 1958 divers retrieved twenty-eight cases containing thirty million counterfeit British pound notes. In 1963, an official search financed by Austrian authorities of the five-hundred-foot-deep lake proved to be too dangerous, and, according to the article, after at least eight illegal divers died trying to find the treasure, the government banned all future dives.
Filmfacts and Variety note that although Jerry Goldsmith and Bronislaw Kaper initially appeared in Twentieth-Century Fox's credit sheets as composers, only Lionel Newman received screen credit with "Musical Supervision." In the print viewed, Kaper is credited for music with Newman as conductor. Modern sources state that Kaper's score was discarded and replaced by Newman's. The Salzburg marked the final feature credit of the Polish-born Kaper (1902-1983) who wrote more than 150 film scores, dozens of which were for M-G-M in the 1930s through the 1950s. The Salzburg Connection marked the American feature film debut of Austrian actor Klaus-Maria Brandauer.