The original play opened in New York on 21 February 1928.
The transformation scene was done in much the same way the beginning part of the transformation was done on Dr. Jeckyll and Mr Hyde. The actress was made up in exaggerated highlights and shadows (including her teeth) using a single color shade of makeup. When filmed through a filter the same shade as the makeup, it's invisible to the camera. Take the filter away and the makeup suddenly becomes visible. Besides a filter, the makeup can also be hidden by similar colored light. This type of trick was only possible on black and white film, of course.