The title refers to the song "The Wearing of the Green", an anonymously-penned Irish street ballad dating to 1798.
The final Porky Pig solo film of Warner Brother's Cartoons' classic period until My Generation G... G... Gap (2004).
The leprechauns are smoking traditional Irish clay pipes, called duidins, but they are upside down in some shots.
The castle door knocker is an upside down shamrock, a sign of Porky's bad luck to come.
The curse of the green shoes is similar to the fairy tale The Red Shoes, where the person wearing them must dance all the time.