the posters in the pool hall where Lupin and later Benson are in.
Bucky and Butcher from "You're a Cat, I'm a Dried Bonito" and Buckingham from "The Chewing-Gum Disguise Operation" make cameo appearances at the beginning of the episode.
The name Dokonjo was influenced by the manga Dokonjo Gaeru (known as The Gutsy Frog in English) and TMS also did the anime adaption.
In Japan, this episode along with Diamonds Shining in the Robot's Eye, You're a Cat, I'm a Dried Bonito and The Chewing-Gum Disguise Operation are nicknamed the "Broadway series".
The East Side Story billboard is a reference to the musical West Side Story.