In Moo Moo Farm, just before the archway there is a slant into a fence on the right side of the track almost facing the finish. I was glitch hunting and on a attempt mushrooming and jumping into the wall there, I got a jump and the mush made me hit the wall again, but instead of bouncing over it, I tumbled backwards like getting zero framed. Have done ithe backwards bounce twice non TAS. I know that there is a pause buffered TAS shortcut. Maybe you do the jump with a shroom and use the other two to boost father to hit a respawn point later in the track? I don’t know.