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Just read a very interesting article - somebody extracted subtitle data from ICO and found a lot of extra dialogue that was cut from the final game. Most scenes have a few extra lines of dialogue and a couple of scenes were cut.
(Don't be worried about the extra parts "ruining your personal interpretation" or anything. It doesn't dramatically change anything about the characters or backstory. Just adds a little more detail, a bit more character development and clarifies a few things. Nothing added to the ending.)