This is more a camera trick than a glitch (like you usually find in SM64) but it's pretty cool anyway. First have the moat drained. When you start outside the castle, go inside or to the Blue ! place and change the camera to Lakitu-Stop. Now come back out and into the lake. Now go across to the side without the cannon that has a brownish type color looking wall. Now, get this-walk up the wall.(crawling also looks cool too) After you're done messing around with that, find a spot on the wall that you can stand still and not fall down. Face away from the wall, and hit up-C so it's "Turn Mario's Head Camera." Turn so you can see inside the wall.Then hold R for stop camera. get out of "TMHC," but still hold R. Now run around, and it should look like Mario's running on thin air! Now, still holding R, run over to the trees by the castle. They should be floating also. Now climb one. Go to the top and do a handstand. Mario is invisible! Now, if you jump off, Mario will reappear the instant he leaves the tree!!