According to series creator Tetsuya Nomura, the original data and assets for Kingdom Hearts had been lost, forcing Kingdom Hearts HD 1.5 Remix to be remade from the ground up:

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.

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.