so i got the demo yesterday i just found it right now.so go to the last level on the demo after the roller coaster one.then wen pass the hand and a checkpoint should be right after in the big jump right there it the rock were u have to land on the other side fall down.there should be another hand then land good and it should blow up a no motorcycle sign and u fall all the way down to grass.thanks thats the easter egg that i just found on my own.