Visiting the Universal commissary for her lunch whilst still wearing Hilda Courtney's cockney disguise, Patricia Morison was sternly ordered by the maitre d' to eat with the rest of the extras at the counter, rather than at the actors' tables.
During the UCLA Sherlock Holmes Restoration Project (1993-2003) they were unable to find any 35mm elements of the main title for this film. The restored version uses a blow-up from a used 16mm television syndication print which was dissolved into the proper point. The main title of the restored version shows a decrease in resolution, increased grain and a reduction in image registration.
One of several titles in the Sherlock Holmes series whose original copyrights were apparently not renewed and have thereby fallen into public domain; as a result, seriously inferior copies are presently being offered by a number of VHS and DVD dealers who do not have access to original studio masters.