When the Stooges are pretending to be children, Larry uses the name Mabel. Mabel was the name of Larry Fine's real life wife.
The painting on the wall in the dining room scene is "Interior of a Roman palace, obelisk beyond" by Hubert Robert.
Curly has a bruise or wound visible on his right knee when the boys first show up in children's clothes. He has a bandage on the knee at the end of the film. Update: the bruise is actually on Curley's left knee and always has a bandage throughout the film. Periodically, the bandage is replaced with a fresh one.
Production reel #487.
The title is a play on the line "All the world's a stage, and all the men and women merely players," from Shakespeare's comedy, "As You Like It."