If you goof around on the slots (search the forum, not sure if anyone found a definite method of triggering it, maybe three of one of the higher-counting things in a row?) you may end up with a clefairy appearing. It will point to the left, right, or center. If clefairy appears, don't stop the slots left-to-right, stop them in the order clefairy says.
In this case, you'll almost always get three of a kind of one of the low-counting things. You'll get coins this way, though in my opinion it takes forever. I don't know what triggers clefairy going away...you're supposed to not stop the slots when the moon is red or something, and if you do enough wins in a row with clefairy out you'll get another round, or something.
Talk to people in the game place, and try playing around with it. :P