in 4-2, backward jumps or wallclips are needed to put mario to the right of the screen for wrong warp. one of the challenges i've been doing is to see how far mario can get to the right of the screen before he has to exit the level at the pipe at the end (don't take the warp). Can you guys get mario all the way to the right of the screen?

yes with vine warp glitch you can get him all the way to the right in one teleport

Getting Mario all the way to the right of the screen is used in the softlock wr: https://www.speedrun.com/smbce/run/z5r3kjdy

You could perform blazit and let Mario slide as far to the right as possible

Here's a video I made of doing the vine clip, super easy