It was shot back to back with Incident at Victoria Falls.
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The film also featured a number of historical characters involved in the plot including Eliot Ness and Sigmund Freud.
Sherlock Holmes | Lady Gaga | My Fair Lady | Princess Alexandra, The Honourable Lady Ogilvy | First Lady of the United States | Oliver Wendell Holmes, Jr. | Oliver Wendell Holmes, Sr. | Larry Holmes | Lady Antebellum | Oliver Wendell Holmes | Lady Macbeth | Our Lady Peace | Lady Chatterley's Lover | Lady and the Tramp | Our Lady of Guadalupe | Lady Godiva | Eleanor Holmes Norton | Lady Jane Grey | lady-in-waiting | Lady Gregory | Lady Justice | Lady | Holmes | Wedding of Charles, Prince of Wales, and Lady Diana Spencer | Sherlock | Lady Mary Wortley Montagu | The Lady of the Camellias | The Adventures of Sherlock Holmes | Our Lady of La Salette | lady's bedstraw |
Previously, Macnee had portrayed Watson three times: once to Roger Moore's Sherlock Holmes in a 1976 TV movie, Sherlock Holmes in New York and twice with Christopher Lee (Incident at Victoria Falls and Sherlock Holmes and the Leading Lady).