* ActingForTwo: In ''The 2nd Runner'', Jehuty's and Anubis' A.I., ADA and DELPHI, share the same voice actress. Cynthia Marcucci and Yoshino Miki are their English and Japanese voice actresses, respectively.
* DevelopmentHell: The Enders Project, the ''Zone of the Enders: The 2nd Runner'' sequel has been put on hold and has yet to resume.
* FanNickname: The [[CompilationRerelease HD Collection]] has coined "UsefulNotes/HighDefinition [[HumongousMecha Robot]] {{Action|Game}}" by the Zone of the Enders: The Unofficial Site as a play on ''The 2nd Runner''[='=]s TagLine.
* TheMerch: Aside from the games and anime, there are wall scrolls, soundtracks, art books, and other products. Special mention goes to the Toys/{{Revoltech}} figurines of Jehuty, Anubis, and the Vic Viper, as well as Kotobukiya's line of model kits.
* NoExportForYou: Prior to HD Collection's version of ''Zone of the Enders: The 2nd Runner'', a [[UpdatedRerelease Special Edition]] of game was released in Japan and Europe, but strangely never to North America. The Special Edition featured some graphical and frame-rate improvements over the original game, new difficulty levels[[labelnote:*]](the Japanese version has an Extreme difficulty and a Super Hard difficulty in-between [[HarderThanHard Very Hard]] and [[NintendoHard Extreme]] mode, whereas the European version only gets the Extreme mode)[[/labelnote]], new cutscenes and battle sequences, an expanded Extra Mission mode, and sub-weapon tutorials for the VR Training. This changed though as the HD Collection includes the European version of the Special Edition of ''The 2nd Runner'' for the North American release.
** And there's the two [[LimitedSpecialCollectorsUltimateEdition premium editions]] for the Japanese version of ''Zone of the Enders HD Edition'', which has ''two'' books instead of one from the overseas release, and a Blu-ray re-release of the ''[[TheAnimeOfTheGame Zone of the Enders: 2167 IDOLO]]'' [[OriginalVideoAnimation OVA]] with the most expense of two packages.
* OldShame: Whilst not necessarily ashamed of the original game, the HD Collection's pre-release hype was all focused on ''The 2nd Runner'', with barely a word being said about the HD remastering of the original game; on top of that, the intro specially made for the HD Collection only focuses on the original game for roughly a minute and a half, with the remaining four minutes focusing on ''The 2nd Runner''.
** To make things even worse, the Hexa Drive patch on the [=PlayStation=] 3 version only addresses the frame-rate issues of ''The 2nd Runner'' and enhanced its visual quality to 1080p; the original game is left untouched. Granted the original ''Zone of the Ender''[='=]s frame-rate wasn't as botched as its sequel, High-Voltage Studios only enhanced the games for 720p when these games were supposed to be in 1080p.
* PreviewPiggybacking: The first ''Zone of the Enders'' was widely known for its inclusion of the highly-anticipated ''VideoGame/MetalGearSolid2SonsOfLiberty'', which was the biggest reason many ''Metal Gear Solid'' fans bought the game. History repeated itself in 2012 with the HD Collection of the series, this time bundling a demo of ''VideoGame/MetalGearRisingRevengeance''.
* {{Vaporware}}: The [[UsefulNotes/PlayStationVita Playstation Vita]] version of the Zone of the Enders HD collection has been [[https://www.youtube.com/watch?v=XqVI4P6I3JQ announced]] at the Tokyo Game Show in 2011 and no word has been said regarding it since.
* WhatCouldHaveBeen: Several design sketches show unused designs for some of the frames. For example, the Raptor was initially supposed to be dual-wielding katana-like weapons, instead of having them grafted on to their arms; as well as unused names for most frames, if the HD Edition's Special Art Book is to be believed, at least. For example:
** ''Jehuty'' went through several name changes, from ''New Eden'' to names such as ''Exodus'', ''The Whisper'', ''Vision Divine'', ''Lightning'' and ''[[OddNameOut Megadriver]]''.
** Similarly, ''Tempest'' had the names ''Faust'', ''I-Vanvo'', ''Epusutain'', ''Vadourv'', ''Devionario'', ''Manonresco'' and ''Volpone'' before settling on Tempest.
* [[MarthDebutedInSmashBros Z.O.E's Music Debuted in Metal Gear Online]]: Some music from ''Zone of the Enders''[='=] soundtracks was reused in [[Franchise/MetalGear Metal Gear Online]]; most notably "Vivid Transparency", [[http://www.youtube.com/watch?v=8N6_mGzAvm0 heard here.]] This has led to a surprisingly large number of people wondering where someone got the notion that a ''Metal Gear'' track is from this game about flying, sword-fighting robots.
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