As much of an expert on the subject of Metroid I might profess to be, I’m embarrassed to admit that I had no idea that much of the following was possible. And in most cases, I have zero idea how they were achieved. But since it’s supposedly running off a SNES, no emulation tricks here:
Though some of them, like the multi-bomb spread, or the crystal flash, are most certainly not glitches. Just stuff most folks don’t know about!