Did You Know?
Although Edward Arnold
was spotted by a viewer as an uncredited member of Moriarty's gang, this identification is dubious. When Arnold joined Essanay in late 1915, he was already important enough to play only credited leading roles, and did so steadily there for the next year, mostly in social dramas, such as the 16 episode series, Is Marriage Sacred? (1916-1917); therefore it's highly unlikely he would have condescended to play an uncredited henchman in this one, as suggested by the contributor of this information. UPDATE: After two screenings in San Francisco and the Library of Congress, numerous audience members agree that it is in fact Arnold. Perhaps he was not working at the moment and did the small role as a favor to Essanay (his scenes could easily have been shot in one or two days). See more
The sign outside Dr. (John) Watson's office reads G. WATSON, M.D. Either nobody noticed the art director's mistake or, more likely, they didn't want to go to the time and expense of making a new sign. See more