Not sure if this is right to put here, but I was looking through the "Things to add in the future" list in the Game Resources page for this game:
http://tasvideos.org/GameResources/NES/SuperMarioBros.html
There's a lot here, but some of them don't seem to be well-explained. Here are some questions I have, I might be able to write some descriptions for some of them when I have the time (once I upload a thing):
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Does the "items not appearing" refer to a glitch where items don't spawn from boxes (something I didn't know was possible), or the much more benign but more well-known glitch where spawning an item makes the current item on-screen disappear?
There's just one called "trampoline glitch". What?
Why is "ducking in water" an entry? Sure, you can do it, but it's not broken or anything (to my knowledge), and I don't think anything weird happens if you do it (though you can use it to get stuck in the wall in the underwater areas)
I'm pretty sure "Win/lose at same time" and "Flagpole death finish (die continuously and win)" are the same thing, no? Unless the former refers to castle levels, in which case it should specify as such.
What is "Jumping Koopas moving unusual directions"?
Pretty sure "Scaling walls vertically" is just repeated wall jumps, correct?
"Falling downward through certain block patterns". Um, what block patterns, specifically?
"Never ending levels (no timer trigger)". This has to refer to hacks, right? Because I'm pretty sure this can never happen in the vanilla game.