Trivia: The Adventure of Sherlock Holmes' Smarter Brother
- Hey, It's That Guy!: Willy Wonka plays Sigerson, Lili von Schtupp plays Jenny, and Digby Geste plays Sacker.
- Or, to look at it another way, this is the reunion of Frederick, Elizabeth, and Igor.
- Bugenhagen plays Moriarty, Mr. Salt plays his henchman, and Ceaser Nero plays Eduardo Gambetti. Mr. Rumbold is Sigerson's manservant, Hunkston. And Sergeant Wilson is Lord Redcliff.
- Fans of The Beatles movie Help! may recognize that Leo McKern (Clang) and Roy Kinnear (Algernon) play Moriarty and his assistant, respectively.
- Looks like Rumpole decided to stop defending criminals and become one instead.
- Hey, It's That Voice!: Mel Brooks voices a henchman who gets fed to a tiger (offscreen).
- Did The Research: The name "Sigerson" is straight out of William S. Baring-Gould's Sherlock Holmes of Baker Street which has long been established Fanon on the level of Word of Dante. According to this book, Sigerson was the name of Sherlock's father.