Directed by: Roy William Neill
Starring: Basil Rathbone, Nigel Bruce, Dennis Hoey
Continuity mistake: When Holmes confronts Dr. Sexton, the detective drops the button he has just found and then pulls out his revolver. In the next shot, the position of Holmes's right arm has changed. (00:58:48)
Continuity mistake: When the human chess game ends and Holmes hears Lestrade knocking from the secret passage, the distance between the detective and Captain MacIntosh changes between shots.
Continuity mistake: When Holmes confronts Dr. Sexton, the detective drops the button he has just found and then pulls out his revolver. In the next shot, the position of Holmes's right arm has changed. (00:58:48)
Dr. John H. Watson: Yes. We told you, you were taking an awful risk.
Sherlock Holmes: Well, we had to have a confession and these egomaniacs are always so much more chatty when they feel they have the upper hand.