* {{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 [[WhatCouldHaveBeen his name early in the show's development.]] This line was eventually redubbed with the proper name.
* MissingEpisode: Two, actually. Although the episodes in question are {{Clip Show}}s.
* NamesTheSame: In August of 2014 Pizza Hut launched a [[https://pizzacat.pzh.jp/ "Pizza Cat"]] ad campaign in Japan. Both [[http://blogs.yahoo.co.jp/robototenko/39047028.html character designer Noritaka Suzuki]] and [[https://twitter.com/ENma_Dororon/status/501591097563291648 Yattarou's voice actor Kappei Yamaguchi]] amusingly noted that Pizza Hut itself was making the same joke they had made over 20 years earlier.
* PlayingAgainstType: Guido's Japanese voice actor Creator/JurotaKosugi is usually known for his deep, masculine voice. Sukashii is a rare instance of him using a much higher, younger-sounding voice.
* WhatCouldHaveBeen: If it hadn't been for licensing issues, these cool cats would've been in ''VideoGame/TatsunokoVsCapcom''.
** It was also recently revealed that there were tentative plans for a police-themed SequelSeries 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").
** The show could have been translated faithfully [[note]]As faithful as dubs of anime made for syndication got in the early 90's, anyway[[/note]] if they had never lost the scripts.