- Peter O'Donnell complains that of his original screenplay, only one line remains: "What do you know about Wilberforce?"
- When Willie Garvin is introduced, there is a close-up of a painting of the comic strip version of Modesty Blaise.
- At one point Modesty Blaise is shown looking at copies of the real-life Modesty Blaise comic strip.
- Peter O'Donnell's novelization of his original script launched a popular series of novels that ran until 1996.
- O'Donnell was invited to write a novelization of this film. The book, based upon O'Donnell's original screenplay rather than this film, was a huge success and spawned a series of best-selling novels that O'Donnell wrote until 1996.
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