I'm not sure if anyone has asked this already, and with my poor memory I can't remember if I've asked myself or not, but...
Birth By Sleep. Donald and Goofy are both seen at the Mysterious Tower. So, in other words, in past events, Donald has been there, and Donald has had to have acknowledged that Master Yen Sid resides in that Tower.
So why is it, that in the events of KH2, that Donald acts completely surprised when he finds out from Pete that Yen Sid lives there? As if it was the first time ever hearing such a thing, like he's never known before?
EXPLAIN THIS.