The easteregg is a egg or the rabbit with blood who kill the guy behind it? XD
Sadly, the list insÂ´t complete, but itÂ´s awesome!
One is Vainilla, the mother of Cream
Other is the little bunny from robots and the capsule of Sonic The Hegdehog... too.
There is another game with rabbits I canÂ´t remember, sorry...