In a nutshell, I used AISSON to fly high enough to the top of the screen so that the timer freezes. When the timer freezes, it apparently is still counting down, you can see me die at the end of the video because of that. To combat this, I unfreeze the timer so that the timer resets itself.

Doing this, I tried going as far right as I could just to see if there was some glitchy stuff that would occur. This is the result:

The video is pretty boring actually, but I wasn't expecting some of the stuff that appeared.

Such as at timestamp 6:36, where I realize that some of the blocks are actually solid and you can stand on them.

This averted some of my concerns that the cheats caused these glitches instead of the actual game, because sometimes, the top of the game can start flashing random textures due to the cheats.

Though, it only was just a single glitchy part that just kept repeating itself for the most part.

Thought this was worth sharing.

I use Nestopia on a keyboard, so it's bound to happen that I hold left and right simultaneously at some point. Though, I have Nestopia cancel any L+R inputs, the problem emerges when I'm preforming Devil's Spell. Instead of releasing right to clip into the pipe, I hold left to cancel right (L+R). Which is basically exploiting the emulator. It seems kind of "cheaty" to me, so I'm just asking to clarify if those are valid inputs, since "right, release" and "right, right+left" output the same thing. I'm still kind of new to SMB2-J, so I'm sorry if this is just me being paranoid.

This is actually a game glitch, but it only happens since the Practice ROM allows me to restart the level at any point of the game. I felt like sharing this because it's kind of cool lol