* DevelopmentGag: The "God is Force" screen at the beginning of ''Armored Core 4'''s intro is a reference to the game's early development codename, ''Project Force''.
* ExecutiveMeddling:
** In Armored Core 4, several places that are named in missions (such as Old/Former Peace City) has had their locations changed between original Japanese version and subsequent versions. At first, Former Peace City is located on what used to be Las Vegas (or at least somewhere in the State of Nevada). The US version changes it to somewhere in the Middle East.
** Thanks to {{Qurac}}-influenced ThemeNaming in Eqbal's products, most of them were named after Islamic terms, such as the Tawhid (''Oneness of God'') arm-shotgun, the Injil (''Bible'') reverse-legged part, and the Zakat (''Charity'') machinegun, amongst others. These were changed into meaningless gibberish such as Zakajj in subsequent versions.
** The 03-AALIYAH mecha became ALIYA most likely due to [[Music/{{Aaliyah}} the singer who died]]. The first A and the H returned in ''For Answer''.
* PreOrderBonus:
** ''Armored Core V'' had two, the Recon pack and Heavy Assault pack, which gave some of the Overed Weapons early without needing to beat the game. Apparently ''Armored Core 4'' had one which added two more [=NEXTs=] to fight in the Simulation (one of which was apparently Nineball) but it's most likely an Internet rumor since there's no proof anywhere.
** VD came with a cool one which came with an artbook, soundtrack CD and a small model AC if you ordered it from Bamco's site.
* RecycledScript: ''Armored Core 3'' and ''5'' are arguably retellings of the first game, which is not helped by both of them seemingly [[ContinuityReboot jettisoning the plot]] from previous entries to start fresh. Corporations run amok and [[TheEndOfTheWorldAsWeKnowIt bad things happen,]] prompting humanity to build underground settlements and turn to AI for government. Said AI [[AIIsACrapshoot goes haywire]] and has to be stopped by a [[PlayerCharacter lone, hypercompetent mercenary,]] paving the way for humanity's return to the surface but also enabling the corporations to [[HistoryRepeats mess everything up all over again.]] [[spoiler:''Verdict Day'' actually makes this cyclic nature a plot point. Turns out that ''V'' and ''Verdict Day'' are the same universe as ''4'' and ''For Answer'', just at different parts of the above-mentioned cycle as humanity keeps destroying and recreating itself.]]
* ScrewedByTheNetwork: The English release of Armored Core V, which put US and EU in separate servers. The series doesn't sell as well overseas as it does in Japan, causing a dwindling playerbase, not at all helped by the game being three patches behind the Japanese version of the game.
* WhatCouldHaveBeen: An OVA for the series was planned titled ''Fort Tower Song'' that was going to take place during the events of ''[[VideoGame/ArmoredCoreLastRaven Last Raven]]''. A [[https://youtu.be/4jmr2S8k-CE?si=UVNMQJTu8xTj4kun teaser trailer]] was all that was released before the project was cancelled due to the studio behind it closing it's doors.