This episode we get an interesting mix of ninja action crosses with Romeo and Juliet. Also here’s some useful translation notes for stuff referenced in this episode(and wiki links for more info):
Goemon Ishikawa XIII: A samurai character from Lupin III,
Jiraiya: A ninja from a Japanese folktale who could turn himself into a toad. His enemy Orochimaru used snake magic.
Orochi: Also known as Yamata no Orochi, or the Eight-Forked serpent, is an 8-headed, 8-tailed serpent from Japanese mythology who was slain by the storm god Susanoo.