* DevelopmentGag: The original Luigi's Mansion was developed with the Gamecubes stereoscopic 3D rendering ability in mind, which was ultimatively never used due the cost of the hardware needed to actually bring the effect out of a TV. Being able to have 3D effects was the reason why the sequel was developed for the 3DS rather than a home console.
* FanNickname: ''Luigi's Mansion: [[Film/TransformersDarkOfTheMoon Dark of the Moon]]''.
* MarketBasedTitle: The game is known as ''Luigi's Mansion: Dark Moon'' in North America and simply ''Luigi's Mansion 2'' elsewhere.
* MilestoneCelebration: Part of Nintendo's ''[[TheYearOfLuigi Year of Luigi]]'', the 30th anniversary of Luigi's debut in ''Videogame/MarioBros''. Incidentally, the inclusion of Luigi's Mansion just happened to be by chance, since it wasn't developed for the anniversary in mind. Nice coincidence, eh?