I don't if this has been posted yet, but I found it while browsing on Youtube and I love it so much I just had to share it! Also, as far as secrets go, it's just so much fun looking for those hidden mickeys, like on Splash Mountain in the form of fish bobbers just as you get to the Laughin' Place song part on the left hand side of the log.
http://www.youtube.com/watch?v=JrUhVAWJ45Q
http://www.youtube.com/watch?v=JrUhVAWJ45Q