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Finish the game with only 50 stars
Ordinarily, you're supposed to have 80 stars to finish the game, but with this glitch, you can finish it with 50. Go into the room on the third floor which contains the levels "Tick Tock Clock" and "Rainbow Ride". Once you enter this room (which requires 50 stars to enter), run to your right, and climb onto the second step. Angle your character so that they're about halfway between the corner and the edge (and have them facing the corner). When they're in this position, charge up a run, start running, slide kick, and hold right on the D-pad. If all goes well, you'll slide into the corner, and get shot into the sky. From here, you can navigate your way to the top of the endless stairs while they are still endless, and enter "Bowser in the Sky", and hence finish the game, with only 50 stars. This glitch can also be used to access "Bowser in the Sky" as characters other than Mario.
Ghost Rabbit
As Wario, go outside to the Boo-infested courtyard. Position yourself so that a Boo is between you and the rabbit. Run and dive for the rabbit. As you do, the Boo will solidify and knock you away while you catch the rabbit. Then walk back to the rabbit. It will not move, but it is now untouchable, like a Boo when it transparent. This can also get funny screenshots if Wario stands inside the rabbit, which makes it look like Wario has rabbit ears.
Infinite coins!
In Cool,Cool Mountain, go down into the cottage and go down the slide. Exit the cottage and kill the three goomba and grab their coins. After you get the coins, go to the warp and repeat the steps above. The coin counter only goes to 255 so that will be you're high score. It takes time but eventually you will get there.
Infinite stars in multiplayer mode
In multiplayer mode, get the Wario hat and grab a player by standing next to them and try to punch them. Throw them, and grab the star that falls out of them, (If they have a star). Pick the enemy up again and ground pound with them in your hands. They will drop another star, even if they have none in their count. Rinse and repeat for as long as you like.
Walk Underwater in Dire Dire Docks
When Bowser's Submarine is still in the docking area, head over to one of the back propellers. It is just slightly above the water. While underwater, jump up under it then quickly Ground Pound. Your character will fall fast through the water and land at the bottom. You can now walk underwater, so you can easily grab several of the Stars that lie there. This only works while Bowser's Submarine is there.