- Big Name Fan: Mark Gatiss considers the film a masterpiece and cited it as a big influence on Sherlock.
- Creator Backlash: Billy Wilder said of this film in the book Conversations with Wilder by Cameron Crowe,"... when I came back [from Paris], it was an absolute disaster, the way it was cut. The whole prologue was cut, a half-sequence was cut. I had tears in my eyes as I looked at the thing...It was the most elegant picture I've ever shot."
- Deleted Role: Stills and soundtrack show John Williams in a substantial role as a bank official and Edward Fox as Inspector Lestrade. All their scenes were ultimately cut.
- Executive Meddling: The film was severely cut down by the studio.
- Missing Episode: The film was envisioned as a collection of several short stories, with two more segments filmed but ultimately left out of the film to keep the running time down. One of them is included in some home video releases.
- Playing Against Type: Christopher Lee playing a good guy for once as the duplicitous Mycroft Holmes.
- Promoted Fanboy: Billy Wilder was an avid Sherlock Holmes fan.
- What Could Have Been:
- The original idea had four stories involved, two of which (one in which Watson solves a mystery on a cruise and one in which Holmes solves a murder in an upside-down room) were edited out. The latter featured Inspector Lestrade.
- Billy Wilder originally planned on casting Peter O'Toole as Holmes and Peter Sellers as Watson.
- George Sanders was supposed to play Mycroft, but dropped out at the last minute and was replaced by Christopher Lee. Laurence Olivier was also considered for Mycroft.
- Rex Harrison wanted to play Sherlock Holmes, but Wilder turned him down. Charlton Heston was also considered for Holmes, but Wilder would hear none of it. (Chuck did play Holmes in the stage play and the 1991 film version of The Crucible of Blood). Richard Attenborough was considered for Watson.
- When Wilder was having trouble casting Holmes, Jack Lemmon expressed interest.
- Word of Dante: The movie takes Holmes' older, smarter brother Mycroft and suggests that he was the head of the Secret Service, and that his frequent haunt, the Diogenes Club, was a front. In canon, neither are other than what they appear to be (a Brilliant, but Lazy civil servant and a club of reclusive eccentrics specifically), but this interpretation has become a popular one.
Trivia / The Private Life of Sherlock Holmes