This one I had to see to believe.
Yep! It's there! I have watched this move a million and a half times! Seriously. Disney XD loved this movie when he was a little guy. When I heard of this Easter Egg I thought for sure it was fake. I decided to put the movie on and see for myself. Sure enough 7 minutes and 19 seconds there it was!
The 84 is for the year that the first Apple Macintosh computer was released.