"Lux Radio Theater" broadcast a 60 minute radio adaptation of the movie onSeptember 14, 1942 with Tyrone Power reprising his film role.
Robert Donat, Laurence Olivier and Richard Greene were also considered for the role of Clive Briggs.
Appearing in this film are no fewer than twenty performers who appeared in at least one of the Sherlock Holmes movies with Basil Rathbone and Nigel Bruce, including Nigel Bruce who played Ramsbottom.
Clive (né Vivian) James chose his name from this character.