Robyn Millan, who played Sharon Kagel, received an 'introducing' credit. This was despite the actress having had numerous film and television credits over the past decade or ten years since 1965. Millan had mostly worked in television upon until this movie but had actually appeared in a few theatrical feature films.
The type of jewel that the ''Star of India'' is was a 563.35-carat black sapphire gemstone.
According to a title card in the movie's closing credits, the "names and characterizations of persons other than Murph the Surf and Allan Kuhn have been changed to protect the innocent".
Many movie posters for the film ran with a long blurb / text preamble that read: ''The True Story of Two Miami Playboys Who Liked the Girls and the Good Life Enough to Turn Con Men and Pull Off the Biggest Job in History! And the Cops Knew It, But Couldn't Do a Thing About It!''.
The movie's opening title cards read [in order]: "This film is based on actual events" and "October 29, 1964"