There is the little room with the two statues and ganondorf, but no more of the castle was coded for ocarina of time. Also if you look at the top of the castle [gameshark of course] it is flooded and there is water running across the top. But the flooding is just a coding error that was never fixed due to the fact that you cannot get there.

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"Sometimes, girls need to be told to be to keep in place. So whenever your arm candy starts to speak without being spoken to, I'd suggest you smack her, and/or verbally abuse her. It's the way Jesus would do things. And I follow Jesus. So, don't be sacreligious, and be sure to hit them whenever you see necessary."