The scene in which Holmes and Watson make a series of deductions from a dead man's watch closely mirrors a similar sequence in "The Sign of the Four" (as does Holmes' ability to follow the carriage's path whilst blindfolded), in which Holmes uses nearly identical observations (scratches around the watch's keyhole, pawnbroker's marks on the inside of the case) to deduce information from a watch belonging to Watson's late brother. Holmes's passing reference to locking Watson's checkbook in his desk parallels a similar statement in "The Adventure of the Dancing Men", which commentators such as William S. Baring-Gould have taken to mean that Watson had a gambling problem, an interpretation that the film adopts. Holmes also uses a riding crop as a weapon throughout the film, as he does in "A Case of Identity". In the "Six Napoleons", it is described as his "favorite weapon".

Film

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