The entire events of this episode were exclusive to the anime.
A reference to the real world is made; Emperor Pilaf is trying on a crown when the pawn shop owner reveals it to have been worn by Alexander the Great, the Macedonian Emperor. Following this, it is revealed that the crown actually belonged to "King Ralph", likely referencing the 1991 film starring John Goodman.
The newspaper the shopkeeper is reading makes reference to the real world as it says "Mexico '86", referencing the 1986 FIFA World Cup hosted by Mexico.