Super Mario 64 Glitches

Get To Castle Roof Early
What you have to do is go to the right side of the castle and do a double jusp on the hill slant. It may take awhile, but you can latch on the the edge of the castle and jump up. Eventually, after some more jumps, you will get to Yoshi and give him a nice surprise.

You need 120 stars to get to Yoshi.