This episode showcases the past times when Lupin and Goemon had a duel with each other, from The Coming of Goemon the Thirteenth (1971), A Wolf Calls a Wolf (1971), Falling Cherry Blossoms: The Mysterious Gang of Five: Part 2 (1978) and Lupin the 3rd: Episode 0: The First Contact (2002)
The spirit of Goemon that Goemon himself encounters bears his appearance from Lupin the Third (1971). In that series Goemon was a definite adversary to Lupin, before the two became friends.
Enzo taunts Goemon with him being part of the Lupin Collection. This is a reference to the ending of Rupan sansei: Nusumareta rupan (2004) where Becky Lambert considered the Lupin Collection to be Jigen, Goemon and Fujiko.
This is the first episode partly animated by North Star Studio, an animation/production company based in Thailand.