The film utilized the Dunning-Pomeroy Matte process (an early predecessor to blue-screening). When this film was originally being restored, the elements for the film that is projected in the picture were lost. As an inside joke, the restorers filled it in with a scene from At the Crossroads of Life (1908), a picture that D.W. Griffith himself starred in.
Is thought to be one of the very first, if not the first, theatrical public service announcements. Ladies were told to remove their hats in the cinema or the nickelodeons, or face expulsion. Today we have announcements about noise, babies, cell phones, etc. that are in the same vein.