According to one of his biographies, one of the directors who was offered this project, but turned it down, was a then young filmmaker called George Lucas. Wikipedia states: ''George Lucas was offered the chance to direct, but he turned it down in favor of focusing on finding a studio for American Graffiti (1973)''.
Cast members, Robert Duvall and Donald Sutherland, have also both appeared in M*A*S*H (1970), The Eagle Has Landed (1976) and Invasion of the Body Snatchers (1978).
Jennifer O'Neill replaced Susan George in the leading lady role of Paula Booth. This was, according to a 1973 edition of the 'Filmfacts' publication, due to the height difference between her and leading man actor Donald Sutherland whose height at the time measured about six-foot-four-inches.
The movie has ''plot similarities'' with the earlier and then recent heist movie The Thomas Crown Affair (1968) according to Lee Pfeiffer at 'Cinema Retro'. Alan Trustman was a screenwriter on both productions.
Actor Helmut Griem was once attached to be appearing in this film according to production chart(s) published in show-business trade-paper 'The Hollywood Reporter'.