http://www.youtube.com/watch?v=_p-wLEyLNHM
One of my favourite glitches XD
Mine Cart Carnage: Respawn at the checkpoint, and roll + jump.
Mine Cart Madness: Enter level with both Kongs, have DK in control, enter the cart without jumping and get hit by the Necky. Diddy can now jump out of the cart and roll jump, if you roll just before you land on another Necky, you will roll in a straight line. There is a point in the level (where the first tyre is) that will cancel the glitch.