rolling through the bunny ears on the inlane/outlane, top rollovers add bunny ears (25 bunny ears give you a playmate month. Bunny orbit loops also add to the bunny ears. So essentially, whenever you hit a major shot, you have the opportunity to add bunny ears.
hitting the key shots repeatedly will also start various modes like photo shoot, splash, and pajama party. when one of those modes starts, hit the flashing shot. After a while, you'll figure out which ones are valuable and worth going for. Biggest points are in the mansion mulitball. Good luck!