* KeepCirculatingTheTapes: This game was never re-released on other consoles.
* WhatCouldHaveBeen:
** Cornell was planned to be playable in the original game from the beginning, and his alternate costume in ''[[VideoGame/CastlevaniaLegacyOfDarkness Legacy of Darkness]]'' was what he was going to wear originally. He was also named "Cornell Reinhardt" originally, with "Schneider Belmont" being Reinhardt Schneider's original name.
** Carmilla, modeled after her ''[[VideoGame/CastlevaniaRondoOfBlood Rondo of Blood]]'' incarnation, was poised to be a boss.
** Instead of Henry in ''Legacy of Darkness'', a large shotgun-wielding man named Coller was a playable character (he ended up being recycled into the chainsaw-wielding Frankenstein).
** Coller was also supposed to have a female rival, only known as "[=Coller2=]".
** The bad end for Carrie was originally going to have more weight to it, with Malus' engagement ring being an item that would increase stats.
** The Fernandez warrior was originally supposed to be Sypha Belnades from ''[[VideoGame/CastlevaniaIIIDraculasCurse Dracula's Curse]]''. In fact, the theme that plays when introducing her is still named "[[TheArtifact Sypha]]" in the Original Game Soundtrack.
** Screenshots and [[DummiedOut unused content]] suggests that the game was to have a magic system and more sub-weapons, including a [[VideoGame/CastlevaniaIISimonsQuest stake]].
** Internal dev text indicates that "''[[InconsistentSpelling CastleVania]] the Apocalypse''" (closer to the Japanese) was the WorkingTitle.