* HeyItsThatVoice: Cathal J. Dodd reprises the role of Wolverine from [[WesternAnimation/{{X-Men}} the hit 90's 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: 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 ''X-Men vs. Street Fighter''. [[DummiedOut The sprites they drew for her fighting stance were already inserted into the game's data]] (as [[http://rq87.flyingomelette.com/RQ/PP/MSHSF/1.html 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, {{Dr Doom}} and {{Iron Man}} 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 the ''MarvelVsCapcom Origins'' set, but rights issues (and the fact Capcom didn't see ''[=MSHvSF=]'' as "good enough", probably due to Wolverine's infinite combos) prevented them from supposedly doing so.