it's a spin off of the 1979 classic anime movie.
The film's climax involves the villain hanging from a giant clock.
the basic plotline of disrupting the wedding of an evil tyrant and both having a beautiful innocent girl. Also The castle was visually influenced by the film
Shutaro Mendou receives an invitation to Ataru Moroboshi's wedding. When Mendou's servant brings him the letter, he delays reading it for him, in a verbal exchange identical to the one between Jodo and the Count
Poster is shown.
At the end of the 3rd episode of the show, the main characters recreate the clock tower scene from the ending of Cagliostro at the school talent show.
The fight scene Batman and Fugate have atop a clock tower was an intentional allusion to Miyazaki's Castle of Cagliostro.
The scene where Batman is washed down the sewer is a shot-for-shot remake of the scene where Lupin is washed down an aquaduct in Cagliostro.
The files that Zenigata was looking at, at the restraunt had pictures of the Count and the Castle from this movie.
Mentioned by Kamon in Episode 5: Brittle Bullet
Tomo-chan imitates Fujiko by calling "Rupan" in a fantasy
Chihiro runs down the staircase just like when Lupin ran down the rooftop.
The "Claws" resemble the Assassins in that movie.
The crystal Jack seeks is called "The Crystal of Cagliostro," referencing Miyazaki's "Lupin the 3rd" film.
Mr. Nishizawa's elite force army resembles the Count's assassins.
Identical Fiat 500 car in both films. John Lasseter is a friend/fan of Miyazaki's films
a shot where Bart rolls down the roof was inspired by Lupin running down the castle roof during his rescue attempt
The Cat's Punch opening parodies the Casino robbery scene.
The main theme song of the movie was played in various scenes, also there's a part with Lupin watching the movie at a theater along with a torn poster of it.
When Nick visits Sheeni and runs from the police he is wearing the same attire as Lupin the Third
movie is reviewed
Keroro & Tamama both fell into two seperate trap doors that resemble how Lupin fell into a trap door. While there's another part that features two guys resembling Lupin & Jigen driving their yellow car the same way during the car chase scene.