* ActingForTwo: Creator/KarenStrassman is the English voice of both Aigis and Nanako.
* LateExportForYou: The Europe release was delayed for a whopping 10 months, nevermind that the game was the first (and ''only'') [=PS3=] game to be [[UsefulNotes/RegionCoding region-locked]]. Fans were pissed to the point where they actually threatened to cancel pre-orders and boycott the launch. Atlus would go on to promise that they would make very sure the catastrophe will not happen again and didn't try the same gimmick with ''Ultimax''.
* MarthDebutedInSmashBros: Labrys debuted in this game for overseas players, as the [[RadioDrama Drama CD]] she originated from [[NoExportForYou was never released outside of Japan]].
* ScheduleSlip: In Europe, the game was originally slated for a September 2012 release. European distributors Zen United[=/=][=PQube=] were finally able to confirm a May 10th release in the middle of March 2013. In comparison, ''Persona 4: Golden'', the UpdatedRerelease of the original ''Persona 4'' for Vita, was released in February 2013 in Europe.
* SimilarlyNamedWorks: An odd example involving [[OfficiallyShortenedTitle official abbreviations]] of works within the same franchise -- In Japan, ''Anime/Persona4TheAnimation'' uses ''[=P4A=]'' as its abbreviation, separated from this game, which uses ''[=P4U=]''. However, outside of Japan, this game is also known as ''[=P4A=]'' instead due to its MarketBasedTitle. Cue bouts of confusion when attempting to discuss this game on anime forums.
* TheOtherDarrin: Fuuka's voice is now that of Creator/WendeeLee instead of her unidentified actress from ''VideoGame/Persona3''.
* WhatCouldHaveBeen:
** Ryotaro Dojima [[http://www.siliconera.com/2012/03/23/what-if-ryotaro-dojima-in-persona-4-the-arena/ was considered]] as a playable character (instead of a Persona, he'd summon Nanako, giving the impression he would have been a JokeCharacter), but Atlus bluntly shot the idea down.
** Akihiko's initial design for the game was, in the words of Zen United, similar to Creator/JasonStatham in ''Film/TheTransporter'', implying Soejima may have planned to give him a design similar to his ''Anime/PersonaTrinitySoul'' appearance. However, the director felt a 'wild man' was needed, and influenced Akihiko's drastic change in appearance.
** Aigis was intended to have a braided ponytail in her new design. That went to Fuuka in the end.
** Going through the sound test in Gallery mode shows some unused lines for each of the characters, including the Investigation Team calling out their Ultimate Personas, and the Shadow Operatives calling out their own initial Personas. Obviously, the unused Personas were considered for the game at some time, but ultimately failed to make it into the final product.
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