Included in "Buster Keaton: The Shorts Collection" blu-ray set, released by Kino.
During the play, a cardboard house threatens to falls on top of Roscoe 'Fatty' Arbuckle but he remains save by standing in the location that an open window ends up. Buster Keaton would use this gag again, with a much larger and sturdier house, in Steamboat Bill, Jr. (1928).
"Backstage" Made it's premiere showing on 1 September 1919 at Grauman's Million Dollar Theatre, in Los Angeles.
(Los Angeles Evening Herald, 1 September 1919)