Trivia: The Hound of the Baskervilles
- Billing Displacement: The 1939 film is the only Sherlock Holmes film where the actors playing Holmes and Watson did not get top billing. Richard Greene the actor who played Sir Henry got the top bill. Rathone got second billing and Nigel Bruce got fourth billing.
- Hey, It's That Guy!: In the 2002 adaptation, Holmes and Watson are the Duke and Professor Quirrell.