Closing credits show some of Sidney Paget's illustrations for the stories originally published in the Strand Magazine.

This show was very much correct on Victorian fashion and Sidney Paget's illustrations on Arthur Conan Doyle's stories. Therefore, Sherlock Holmes is only wearing the trademark deerstalker on several occasions while visiting the countryside, and not even all of them. In episodes set in London, Holmes is more often seen wearing a top hat, although a few episodes show him with a bowler or a homburg.

The story "The Red-Headed League" was mildly reworked in the television version to serve as a lead-in to "The Final Problem". In the original story, Moriarty doesn't figure at all.