- The Cast Show Off: Rachael Messer can speak Japanese and uses it in the fifth episode as Chise Todo.
- Name's the Same: Kingsman: The Secret Service (which is also about British spies and secret agents) also has the Big Bad's Ambiguously Brown right-hand woman be named Gazelle.
- The Other Darrin: Ayaka Imamura's inexplicably sudden and surprising departure from the voice acting industry due to health concerns in July 2018 resulted in Aoi Koga taking over the role of Ange for the film series.
- What Could Have Been: Though always pitched as a show about spies, one early idea that was floated during scripting was a story about teenagers who took over Japan.
Trivia / Princess Principal