In New Mode, has anyone noticed some checkpoints activating when you die while they are on screen or close to on screen, but you haven't touched them yet? It doesn't work on every level, but I have been able to skip sections of 5.1 and 10.1 with it. Most other places, it isn't worth the time it would take to deplete your health.

This was something I had noticed in my first casual playthrough of new mode, but I couldn't replicate it. Now that I watched your run, it looks like if you die while the checkpoint is on screen it will activate. Weird, but useful.