So I encountered this during a run earlier today and was genuinely shocked by it, as I'd never seen this before.

Holding jump through a screen transition usually allows you to buffer the jump input, so that you jump on the first possible frame and gain momentum. This saves a few frames every screen transition and is best practice.

What I did here was hold jump into the screen transition, then once the jump started, I let go then immediately repressed and held jump, and it led to this SUPER JUMP

This works in every screen transition as far as I can tell, although it's much easier to perform on horizontal screens vs vertical screens. However, it does work on vertical screens. I just think the window is tighter on vertical screens, although I have no proof of that.

The Laser Climb in Stage 5 is the only place I could immediately think of where this trick would save time. But I wonder if there are other spots it can be used? Would be really cool if we could find a way to trigger it whenever we wanted.