When Mr. Cavendish takes the first photo of Miss Blackchurch, the camera is pointing toward the floor and not where Mr. Cavendish is looking.
Rositas takes a photo of the sleeping Charles, arranging his left leg. The developed photo, looked at by Charles, later given to his wife shows that the right leg in the arranged position
Most early photographs were mirrored images.
The date of copyright given at the end of the film is MCMXVII (1917) and not MCMXCVII (1997).
This film is set around 1840. In the first scene in which the two main characters become intimate, you hear a zipper as Mr. Cavendish begins to undress. The zipper was not invented until 1891.