Back Stage (1919)

Back Stage is a 1919 comedy, one of the last films that Buster Keaton would appear with Roscoe "Fatty" Arbuckle before they went their separate ways, Keaton would get his own studio, and Arbuckle got into feature length films.
In this film, Keaton, Arbuckle, and others, work as stagehands, backstage of course, in a playhouse trying to help and in some cases, stay far away from the eccentric and diva-like performers. When the performers rebel and refuse to do the show, the stagehands, along with Arbuckle's love interest, the assistant of one of the rebelling performers, perform in their place- including Keaton showing his ability to do butterflies, no handed cartwheels, while in drag.