There are three bonus levels in the game. For the first, 
abdomen bounce three to five bugs without missing one in a 
level. In the Tunnels level, get the blue berry and kill 
five grasshoppers without missing one. For the third, in the 
Clover Forest level, line five mushrooms up in the beginning 
and hop from one to the other without touching the ground. 
Make sure you bounce once on each of them. Finish the Bug 
Circus, and you will get a new FMV sequence after each one.