It seems like the film's completely lost, but some scripts, notes and stills remain. Most likely people confuse it with the Dr. Jekyll and Mr. Hyde by John S. Robertson (http://mubi.com/films/dr-jekyll-and-mr-hyde--3), also released in 1920, which can be downloaded from http://www.archive.org/details/DrJekyllandMrHyde.
Is this film completely lost? If so, how did they get that still image? Why are there fans of this movie if it doesn't exist? If anyone has any information, please help me, I'm most anxious to watch this.