Start game play in the training level and complete all of Mr. Soil's objectives. After that, bounce on all the spiders to kill them to reach a hidden level. Complete this new level to view three FMV sequences.
For the first of three bonus levels, abdomen bounce three to five bugs without missing one in a level. In the Tunnels level, grab 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. Complete the Bug Circus, and you will get a new FMV sequence after each one.