Another thing I've noticed as I've progressed is the fact that when Sora, Donald, and Goofy arrive at the Mysterious Tower, Donald and Goofy have no idea where they are and that Yen Sid resides there, yet they were there visiting Yen Sid 10 years ago in BBS. Of course, it's because BBS wasn't a game yet and was still only in the early stages of conception, so in terms of continuity, we'll just have to write that plot hole off as them just forgetting over the years that they were there.