-Test room left over on the disc. The first room is reminiscent of the foyer. There's a Toad crying for help in the south west corner, the Butler is going back and forth near the center of the room, the Butler's candles are in the floor, a King Boo is halfway in the floor, a large version of Luigi's arm is next to the fire and there's a picture of Mario in the air. Because I lack a saved game that has the fire element, I don't know if actually lighting the candles will trigger anything (or if the fire even will even send out a fire elemental). The Toad can't be talk to, nor does King Boo do anything. Having a Gameboy Horror and scanning leads to nothing (scanning the Butler's heart freezes the game). The arm seems to be the one used for the door opening cutscene (given the length and look of it; loaded for testing?). The room on the right has Luigi's steps set in a different environment (outside), and music starts up from the dance room in the main game. The only ghost in here is the male half of the dancing couple (usage of GBH makes him visible). The north room has a few circular tables and rectangluer ones, all of which can be walked through (excluding their legs). The east room has two ladders, and a similar build to the Foyer-like room. Note that the clock is different (though, the west room one is the same as the real Foyer). Touching/Talking to/Standing in front of King Boo triggers something that freezes the game (as evident by the freeze at the end of the video).
-An old version of the gallery still on the disc. Notice that it isn't lit up, nor are there places on the walls for frames (I attempted hitting "A" at places where they would be to see if it would activate something.) The angel statues were originally the unicorn ones seen during the Boolossus fight. The chamber for King Boo's image is a bit under furnished in comparison to the final's.
*Bolded = Unused*
* = my notes.
Aaahhhh! ... Ugh! Ouch... Ooof... I sure take a lot of knocks in this line of work. I'm getting too old for this ghost-catching tomfoolery. Anyway, nice to meet you. I'm <COLOR>(3)Professor E. Gadd<COLOR>(0). This house... I swear it seems to have more ghosts every day! What's a young feller like you doing around here, anyhoo?
Uh-oh! This looks ugly. All right, youngster, look lively! Follow me, posthaste!
The "Waggawaggawagga!" line, I believe, should've displayed right when the trio of orange ghosts appear, given where it is and the lines that follow.
In Melody's ungodly insane difficult piano guessing game, there's a few choices you don't get to pick:
What a stirring performance! I haven't been so charmed by a piece for ages!
You must have a delicate ear for music. Would you like to listen to my piano sonata?
Well, here I go.
*Melody would play the piano here*
Er, I don't know.
Super Mario World
Super Mario Bros. 3
By the way...do you know the name of this piece?
By the way...what image do you think the piece's composer had in mind while writing it? *First set
By the way...that song was featured in a famous game. Do you know which game? *Second set
By the way...I wrote that song. Do you know what it is called? *Third set
I'm pretty sure this is where Totaka's Song was supposed to appear, instead of the controller style select menu. Or perhaps it still does?
-Daisy image using Mario Tennis art. Found next to the posters Luigi can suck up.
-Unused talking head icons. Mario's would have probably appeared when he say, "Get me outta' here!" when Luigi visits him in the well. The orange ghost icon most likely would have shown up when the unused dialogue appeared. The other two have no real purpose.
-Unused ending images, found in the "Ending" directory.
Found in the model directory for "obake01" and "obake02." Brought to my attention by TCRF. (Awesome stuff!)