Although based on a fictional short story by Robert Louis Stevenson, the author came up with the idea from actual events occurring in 19th century England and Scotland, particularly those of grave robbers Burke and Hare.
Robert Wise on Henry Daniell: "Henry was as far from a complainer as any I've ever known. He'd walk onto the set, do his work like the pro he was, do it damn good, and then quietly leave without being a burden to anybody. Period."
The quote from Robert Wise on Henry Daniell was a subtle dig at Boris Karloff who notoriously used his clout and SAG creator status and membership to complain about long hours and other miscellaneous details during production.