Mario Pinball Land Bonus board:
Collect all 35 Stars to unlock a bonus board in Bowser's Castle.
Easy stars:
When entering a level you have not been to, have a Thunder Bolt icon in your inventory. When the enemies appear, press B to use it for an easily earned star.
Time attack mode:
Defeat the Bosses in any two Worlds.
Collecting blue coins:
To get blue coins, you must do a combo. This means defeating two or more enemies between Mario hitting the flippers (hit + kill 2 enemies + hit =1 blue coin on the board).