So I've messed around with my FF type-0 a bit (well, a lot) and found something interesting:
Yup, a couple of perfectly square, low-res icons, located out of bounds of Portal Room. Clearly, these icons are remnants of debug room or some kind of quick teleport. I can't do anything with them, they just... rotate and flash. No action point, no reaction on walking through. Does anyone have any ideas on how to access debug room? It's so close, I can smell it.