On my early stern (big game), if you tilt before hitting a switch, you will get your ball back for free once it drains. It will not advance to the next ball. I assume his works on all classic sterns.
On Baby Packman, after coming up from the right pacscalator on the first level type, you can leave Pacman facing up at the top of the tunnel and the ghosts will get caught in an infinite loop and never come under that wall you're facing to get you. I would use this to essentially pause the game if I needed to walk away from the game for whatever reason. Also a good way to get all the ghosts together before grabbing an energizer pellet to eat them all at once.
I have a couple more for baby Pacman, but they are too hard to explain. I've always wanted to record a tutorial of that game in the hopes that people would gain a new respect for it.
