Lost for some 50 years after it's cinema screenings until a copy turned up in a Belgian archive in 1974.
Duck Soup is American slang for something that is easy to do.
Stan Laurel originally cast a Roach company stock player named Syd Crossley to play Oliver Hardy's part. For unknown reasons, Crossley failed to make the transition from script to screen.
The title was later used for a Marx Brothers film (1933) and an Edgar Kennedy short (1942)
The first movie in which Laurel & Hardy appear in their "Stan and Ollie" characters.