* ActorAllusion: If you happen to play as [[Creator/EriKitamura Type-B]] in ''[=SaiDaiOuJou=]'' and was able to get to [[AoiYuki Hibachi]]'s TrueFinalBoss form, then you may have been able to spoil the entire second half of ''Anime/PuellaMagiMadokaMagica'' [[ItMakesSenseInContext inversely]] and [[FridgeHorror straight]]. [[http://www.youtube.com/watch?v=P_QBisDe2OQ&t=3m20s Go figure]].
* DevelopmentHell -- There is a patch for the XBox 360 version of ''[=DaiOuJou=]'' that fixes the numerous bugs in the game (see PortingDisaster). It took about ''two years'' since the game was released to make; by the time it was out the sequel ''[=DaiFukkatsu=]'' was already ported.
* FanNickname: In ''[=SaiDaiOuJou=]'' [[spoiler: Hibachi is called "[[MoeAnthropomorphism Lolibachi]]" or "[[Anime/PuellaMagiMadokaMagica Mado]][[Creator/AoiYuuki bachi]]"]]
** Ketsupachi for ''[=DaiFukkatsu=]] BLACK Label'' Arrange Mode on the XBox 360. (See CrossOver).
* HeyItsThatVoice:
** In ''[=SaiDaiOuJou=]'' [[spoiler: Hibachi]] is voiced by Creator/AoiYuuki, the voice of [[Anime/PuellaMagiMadokaMagica Madoka Kaname]].
** In ''[=SaiDaiOuJou=]'', Hikari is voiced by Creator/EriKitamura, the voice of Sayaka Miki.
** In ''[=SaiDaiOuJou=]'', Saya is voiced by Creator/AyaHirano, best known for [[LightNovel/HaruhiSuzumiya Haruhi Suzumiya]], [[Anime/FairyTail Lucy Heartfilia]], [[Manga/LuckyStar Konata Izumi]], [[Anime/KiddyGrade Lumiere]], and [[Manga/DeathNote Misa Amane]].
* KeepCirculatingTheTapes; ''[=DoDonPachi=] Campaign Version'', a single board of which was distributed, and to a contest winner. As such, this version is not available in MAME, and if the board becomes damaged beyond repair, this piece of history (and arrange mode of ''[=DoDonPachi=]'') is gone. '''Forever.'''
* NoExportForYou:
** The first game has a proper US release, and the second has an "International" release. And that's only for arcades; none of the console releases have made their way outside of Japan.
** Rising Star is set to finally end this trend with a European release of ''[=DaiFukkatsu=]'' (under the English title used for the iPhone game) in November 2011. However, North America shows no sign of getting it.
*** Rising Star has announced that the European release will be compatible with US-NTSC consoles. So North America ''does'' get it... if they're willing to import. However, an EU XboxLive account is needed for the V1.5 and Black Label DLC's. And the Black Label Arrange mode (aka "Ketsuipachi") is not available outside of Japan.
*** The iOS ports are downloadable in America, however.
** The retail version of ''[=DaiFukkatsu=] Black Label''. Although the DLC version of ''Black Label'' is available in the PAL version, which has no region lockout, it does not have the the ''VideoGame/{{Ketsui}}'' {{crossover}} arrange mode that the retail version has.
*** {{Irony}}: The ''Ketsui'' arrange mode's soundtrack was arranged by Creator/JakeKaufman, an ''American'' composer.
** ''[=SaiDaiOuJou=]'', though at the least it is region-free.