The file Victor brings to Inspector Zenigata in the hospital reads "Cagliostro" and has images of the Count of Cagliostro and his castle, from a previous Lupin adventure Lupin III: The Castle of Cagliostro (1979).
According to the hand drawn map of the island, the ship is named "Noa's an Ark".
The newspaper articles on the assassination, Zenigata being shot and files on the poison do not actually contain the topics they are actually suppose to have. Instead it's random sentences and phrases in English.
The ninth Lupin the 3rd TV Movie.
Bomber's method of assassination, littering his victims with explosives, was just like the one ultilized by a killer Lupin worked with in Episode 7 of Lupin III (1971-1972).