Alright... In the Forgotten Capital, and just about anywhere in that whole Corral Valley area... there are these lifestream pools inside houses. Like inside the seashell places, when you walk in there are circles of lifestream up against the walls. When you press circle next to them, Cloud flinches and says something about how "it's no good" and he "can't understand". You can't go to those places with Aeris because you can't dig up the Lunar Harp before she dies... so are we never supposed to know what those pools/streams of thought were for? D: Is Square being a bitch again?
Oh. And explain to me how Zangan's letter is still in Tifa's piano. Same goes for her money. The place burned down. D: How is it still there? Don't tell me the piano has some kind of magic properties that can preserve it during a fire.