SMB 3 in 3 minutes – World Record Speedrun Explained [video] (2020)

I've watched this video countless times, and it still genuinely amazes me. Reasonably confident I understand the mechanism, but it just leaves me astounded still.

Even watching it again now the World 1 section is like "what? okay", and then the World 7 part hits in me in the face again. It feels like there is magician about to pull a rabbit from a hat, but it turns out the rabbit is a actual esquilax and the hat was a rainbow unicorn nest and the magician was a ghost from the outset.