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In the original version of Kingdom Hearts on PlayStation 2, Selphie's underwear can be seen as she is sitting down. This was removed in Kingdom Hearts HD 1.5 Remix. However, a glimpse of Jane's underwear can still be seen through an opening on the side her skirt.
Contributed by ProtoSnake
Using a text glitch recently found by the Kingdom Hearts speed running community, and walking into the Red or Green room of the Hotel in Traverse Town, random messages from the game's code appears. Some text include random text, dialogue quotes spoken in Traverse Town, or unused text entries. One example is "To 2F | To B1 | Cancel", which may be a clue that somewhere in Traverse Town, most likely the Hotel, it was intended for there to be an elevator.
Contributed by Blazeingphoenix
Geppetto has plans for a train on a wall in his house in Traverse Town, foreshadowing the Big Thunder Mountain summon in Kingdom Hearts III. This is not in the original PlayStation 2 release.
Contributed by ST3