When I saw the link’s title I knew it would be a Bismuth video.
Bismuth’s videos are incredibly detailed and wonderful deep dives into video game glitches and bugs. The videos on Ocarina of Time’s wrong-warp bug are particularly awesome.
I’ll definitely be watching this video after work, and I highly recommend that anyone interested in this sort of thing take a look.
Summoning Salt and Karl Jobst also do good speedrun-explainer videos.
The best IMHO, though not speedrun specific, is Retro Game Mechanics Explained.