- Fountain of Expies:
- Pretty much every female Phantom Thief is at least somewhat based on the Kisugi sisters. The most prominent expies are Kasumi Aso from City Hunter (a professional thief who only steals on commission and for good reasons, who looks like Hitomi and ends up working at the Cat's Eye cafe for good measure) and Alex from Totally Spies! (based mostly on Ai's personality, with her same name in the French dub).
- According to Word of God, Ryo Saeba is loosely based on Toshio.
- Keep Circulating the Tapes: When the now-defunct ImaginAsian carried the rights for the anime, only the first 36 episodes (first season) were subbed, aired, and released on DVD (which is rare to find) and the second season wasn't picked up due to the expiration of licensing rights. Averted, however, in the summer of 2013, when Nozomi Entertainment acquired the rights and subbed the second season, while re-releasing the previous one.
- Name's the Same:
- Juzo the same name of a famous Japanese science-fiction author.
- According to Word of God Shin is not the Big Bad of City Hunter, only a different criminal mastermind with his same face, antics, fashion sense and one more crippled leg more.
- Crossing over with Hilarious in Hindsight, we have Hitomi. How many other Japanese-German girls with that name do you know?
- Relationship Voice Actor: Toshiko Fujita and Chika Sakamoto would eventually reunite in 1999 as Taichi Yagami and Agumon.
- Technology Marches On: An early chapter of the manga revolves around a villain posing as a French art representative named Henriette Rubeal. The villain makes no attempt to alter her appearance, and the only reason her plan is unraveled is because the Kisugi sisters find an obscure photograph of the real Henriette in an old Japanese art magazine. It was perfectly plausible in the 80's for someone to not know what a visitor from a foreign country looked like, but nowadays, in a world with Google and cellphones, her deception would have been uncovered almost instantly. Even the anime adaptation (which was released only a few years after the manga began) altered the story so that the thief simply tied up the real Henriette and used a convincing mask to steal her identity.
- Acting for Two: Drew Barrymore plays Amanda in the third story, briefly appears as James Woods's character's daughter in the first story, and appears as a girl in a commercial that the cat sees on a TV in the second story.
- What Could Have Been: Word of God states that there was a prologue that helped explained the cat's motivations. The cat originally had a family in North Carolina. The parents woke up to find their daughter dead and believe that the cat stole its breath in the night. While the father tries to revive their daughter, the mother takes her husband's gun and chases the cat away from the house. It ended up being cut from the film against the director's wishes because they believed it was "too silly."