Not necessarily 'modes', per se, but here are a few I like.
STTNG: End of ball bonus when Q starts talking about alternate trajectory, pressing the flipper buttons awards an extra 10M.
BSD: Ball goes in the Asylum scoop, press the flipper buttons for extra 5M.
Scared Stiff: Go into lit spider hole, when spider spins, watch DMD. If you see a number 3 go up the web instead of a spider, press the start button 3 times to get another spin on the spider wheel.