1. Several unused audio files are stored in the game, including dialogue from a placeholder voice actor exaplaining how to play, suggesting that the game was planned to have a tutorial. Additionally, the way the game's files are set up suggests that Iggy was going to have his own hotel, rather than appearing in Bowser's.
2. This is the only game in which Mario and Luigi have four fingers. Mario is shown to have five fingers on the box art, but four during the cutscenes.
3. Most of the names of the Koopalings' hotels are puns on real world hotels ("WoodDoor-Hysteria,""Blitz Snarlton," etc.). Roy's HardBrick Hotel, however, is more likely a pun on the song "Heartbreak Hotel."
5. This is the first Mario game to have extensive voice acting and full dialogue.
7. Each hotel has an internal music, graphics and enemy data file, labeled from L1 to L8 (with L0 as two demo files). However, L6 is missing entirely from the list. The game's files show that a hotel would have appeared between Ludwig and Wendy's hotels, as the game skips from L5 to L7. There are no files associated with the hotel, skipping it entirely. This points toward Iggy being planned to have had a hotel of his own, as opposed to appearing in Bowser's.
8. An article announcing the game in the UK CD-i magazine implies that Yoshi was originally the character kidnapped by Bowser instead of Princess Peach and did not mention Luigi being present. However, this could be an error on the magazine's end. This was also the description provided with pre-release copies of the game, though they were largely identical to the final game.
9. The "HERE WE GO!" screen when loading a game or starting a new one will vary if played in a specific region and on a specific day. (like on new years day, valentine day, mothers day and christmas). There are also exclusive English (like on July 4th and halloween) and French (alludes to King cake and Mardi Gras) messages .