A cool little gameplay secret for those of you who own the table or play it via visual pinball: You all probably know that during the video mode with the bullet bills and pits that if you hold the right flipper and run the entire time, if you are able to jump your way to the end without falling or getting hit by bullet bill you get 30 million points for making it the whole way instead of 10 million points for making it the whole way.
Well, there's another cool little easter egg involving the Castle Special video mode after your ball drains. When you destroy Castle 7 and get the Castle Special Award, after your ball drains and you put in your initials, during the video mode where Mario runs towards the castle to rescue the princess, you'll notice that on the ground there's wire-shaped patches. If you jump while on these patches, Mario will jump REALLY high in the air. Right before the castle appears during this video mode, there's a tiny patch. If you jump while running on the patch, Mario will jump OVER the castle (normally he'll automatically run inside the castle), land to the right of the castle, run past a signpost with an arrow pointing right and you'll then get 30 million points for rescuing the princess instead of the 10 million points that you get if you run into the castle.
EDIT: MAKE SURE TO PRESS THE LEFT FLIPPER TO JUMP SUPER HIGH! During the Castle Special video mode, Mario automatically runs at full speed and pressing the left or right flipper makes him jump. But you MUST press the LEFT FLIPPER when on the patch on the ground to jump super high and over the castle! It won't work if you try to jump with the right flipper.