The Three Stooges perform a famous vaudeville routine known as "Slowly I Turned" (aka "Niagara Falls"), which Bud Abbott and Lou Costello performed in Lost in a Harem (1944), released the same year as this short.
[After Curly says Niagara Falls]
Moe:
Niagara Falls! Slowly I turn... step by step... inch by inch...
Crew or equipment visible: During the big show, after the girls fire the rifles and the flags drop, the shadow of the camera is seen as the camera dollies in towards the first flag.