- The first Sherlock Holmes movie to be filmed in color.
- This film was planned to be the first in a series of many Sherlock Holmes films starring Peter Cushing, produced by Hammer Films. The audience disapproved of a Hammer film without any monsters and failed to turn up. The planned franchise was then dropped.
- For his role as Sherlock Holmes he of course had to have a pipe but as Peter Cushing was either a non-smoker or didn't like the taste of the pipe, he kept a glass of milk always to hand to remove the taste.
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