Blooper: In the second episode of the Japanese version, the professor who explains plot points to the audience refers to Koon-no-Kami as Inari-no-Kami. The latter was his name early in the show's development. This line was eventually redubbed with the proper name.
It was also recently revealed that there were tentative plans for a police-themed sequel called "Kyattou Keisatsu Beranmee".
Various preliminary names and titles were printed in magazines prior to the show's debut. Early names for Yattarou included "Bugmaru", "Hypermaru" and "Kagetora", and one early show title was "Mecha Neko Ninpou Chou Bugmaru" (roughly "Mecha Cat Ninjutsu Book Bugmaru").