Douglas Wilmer later recalled that Peter Cushing told him he would rather sweep Paddington station for a living than go through filming this series again.
Douglas Wilmer was infuriated when he first received some of the scripts for the series. He said that the dialogue ranged from being acceptable to downright deplorable. As a result, the actor spent many hours into the night at home, re-typing most of the scripts. The actor stated that the officially credited writers, hadn't bothered to carry out their research, regarding the Holmes stories in general.
The second series was one of the earliest BBC colour productions.
Peter Cushing stated that the hectic schedule affected his performance:
"Whenever I see some of those stories they upset me terribly, because it wasn't Peter Cushing doing his best as Sherlock Holmes - it was Peter Cushing looking relieved that he had remembered what to say and said it!"