Luigi's Mansion: Dark Moon
Luigi's Mansion: Dark Moon
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Citizens of Earth - VG Facts Interview Feat. Dazz
 
When starting a mission in Gloomy Manor, there is a chance that Luigi will be teleported into the mansion landing on the Poltergust rather than on his rear.
Contributed by game4brains
During an interview the game producers said that the mission where the player leads Toad out of the Mansion was inspired by leading Zelda out of the Castle in The Legend of Zelda: A Link to the Past.
Contributed by DarkJedi
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In the Scarescraper, one of the bosses is called Fright Knight, his description reads;

"Rumor has it that this Greenie comes from the middle ages, where he was a knight searching for the kidnapped princess. Sadly, wherever he went, she always seemed to be in another castle"

The last bit is obviously a nod to Super Mario Bros. on the NES, where Princess Peach was always in another castle.
Contributed by Berry
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According to a Swapnote Message sent by the Game's Producer, Shigeru Miyamoto, the Polterpup is his favourite Ghost in the game.
Contributed by CuriousUserX90
While Luigi normally calls out "Hello" or "Yoohoo" when the + Control Pad is used, in the later missions in the Treacherous Mansion, and after finishing the game, he will instead call out "Mario" as a reference to the original Luigi's Mansion.
Contributed by Boyobmas
In the French translation, the first letter of each bonus mission in order reads "Luigi".
Contributed by Boyobmas
The First edition of Luigi's Mansion 2 released in Europe received glow in the dark covers.
Contributed by pAroxizm
There is a cutscene in Treacherous Mansions in which two Strong Greenies bring a suit of armor to life. This is a reference to the film "Frankenstein".
The scene in the Hollow Tree level, in which Luigi looks down the staircase, is a reference to a movie called "Vertigo" and the camera effect named after it.
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In the Treacherous Mansion, the spears which the Greenies use have Kalimba Tiki mask on them from "Donkey Kong Country Returns".
Contributed by KnowledgeBase
The music which is played in the elevator is the same tune which is heard at the pause screen in "Mario Strikers Charged", a previous Mario game which was also developed by Next Level Games.
Contributed by KnowledgeBase
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When you first get a video call from E.Gadd on the first mission he says the he was worried that the battery life on the Duel Scream might die so he turned down the brightness so it would be good for awhile. This is actually a joke about the original DS' short battery life since the Duel Scream is in fact a modified DS.
Contributed by Boyobmas
The opening scene in which Luigi is sleeping in front of a TV which suddenly displays static, awakening him and causing him to reach out towards it, is a reference to the 1982 film "Poltergeist".
Contributed by HPlookalike
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The house Luigi lives in is actually the Rank D house built for him at the end of the first game.
Contributed by Sum_gi
At the beginning of the game, if you look beyond Luigi, you can find the map from the beginning of the first game.
Contributed by gamemaster1991
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The binary code message the ComBooter says to you actually translates to 'BOO'.
Contributed by Skarro
The first letter of each of the five possessor's (boss ghosts) names spell out the word GHOST.

Grouchy Possessor,
Harsh Possessor,
Overset Possessor,
Shrewd Possessor,
Tough Possessor.
Contributed by Davsto
The first letters from the names of the five playable mansions in Luigi's Mansion: Dark Moon spell out the word "Ghost". They are: Gloomy Manor, Haunted Towers, Old Clockworks, Secret Mine and Treacherous Mansion.
Contributed by Waluigi
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Luigi's Mansion: Dark Moon is called Luigi's Mansion 2 in the Japanese and European releases. It was also refered to as this in the first prerelease materials.
Contributed by beat_that_potato