* HeyItsThatVoice: Cathal J. Dodd reprised his role as Wolverine from [[WesternAnimation/{{X-Men}} the hit 1990s cartoon]].
* MarthDebutedInSmashBros: A joke says that for a long time, more people knew of Shuma-Gorath from this series than they did from the ''Comicbook/DoctorStrange'' comics.
* WhatCouldHaveBeen: Creator/{{Capcom}} originally planned to introduce Karin, Sakura's rival from her ''Sakura Ganbaru!'' manga spinoff, as a fighter in this game before they did so in ''[[VideoGame/StreetFighterAlpha Street Fighter Alpha 3]]'', similar to what they did earlier with Shadaloo Cammy in ''VideoGame/XMenVsStreetFighter''. [[DummiedOut The sprites they drew for her fighting stance were already inserted into the game's data]] ([[http://rq87.flyingomelette.com/RQ/PP/MSHSF/1.html as can be seen here]]), and as it turns out, she was originally planned to be a head swap of Sakura with boots instead of sneakers, bicycle shorts under her skirt instead of bloomers, and different gloves.
** According to some sources, SelfDemonstrating/DoctorDoom and ComicBook/IronMan were meant to be in the game, but due to rights issues could not make the roster. Cyclops and Omega Red replaced them instead.
** This game, along with Capcom's other ''X-Men'' fighting games, were planned to be included in ''Marvel vs. Capcom Origins''. However, rights issues, and the fact Capcom didn't see ''Marvel Super Heroes vs. Street Fighter'' as "good enough", prevented them from doing so.