my favorite thing about speedrunning is that if you knew nothing about it, you'd assume that most of the glitches and tricks were discovered by programmers with disassemblers tearing apart the ROMs, since we have that power now. nah. it's like 1%, if that. other than the fucked up "replace the item donkey kong is holding with whatever he last bumped into" shit, almost everything else is "well i was on my fortieth run that day and i accidentally hit B in the middle of a jump and passed through a wall. then we all got on the discord and watched the VOD over and over while screaming until someone managed to replicate it"
My favorite thing that has happened recently:
Binding movement to the mouse allows you to fling yourself at ridiculous speeds while walking, enabling this new strat. This glitch was discovered by breakpod.
Binding movement to the mouse was in the game for a while now. But no one has tried testing what would happen if you do that because why the hell would you do that? Presumably it wasn't tested by the devs for the same reason.