Hey, guys. I just play this game casually, but I'm always willing to help out a community. I accidentally found what I decided to call an "upwarp" sequence break in 5-1 today. You can watch the video here:

I assume that as I collide with the vine on the tree, it pushes me out. And if I approach it at the right angle, the game will think I'm standing on the ground after it pushes me out--so that I can jump again onto the higher platform. I understand that this may likely not be faster, but I was hoping that you guys might use this in order to find similar glitches to make the runs faster. I hope this helps!

That seems like it could be useful, thanks.
Also, you might wanna join the paper mario speedrunning discord server: https://discord.gg/fQNdgay