California Doubling: Set in the Washington, D.C. area, filmed (sometimes rather obviously) in Australia.
Fake American: With the exception of Broderick Crawford as Doc Wheelan, all the American characters are played by British and Australian actors, some of whom are Not Even Bothering with the Accent.
Looping Lines: Alan Cassel's lines were dubbed by an unknown American actor as part of the film's efforts to hide its Australian origins.
The role of Gregory Wolfe was originally written with David Bowie in mind, but the producers "got cold feet" and the role went to Robert Powell instead.
Doc Wheelan was originally meant to be portrayed by Orson Welles, but he asked for too much money, so Broderick Crawford was cast in his place.
