Chuck-Eat glitch (primary) - Yes. Unrestricted
I'm thinking of
some glitched run where, though everything is crazy glitchy, still gets pretty repetitive after a while. Regardless, you will have at least two different levels you can base this off.
It will get repetitive around the third start select revisit, though... But I do want to see all glitch-exits traversed...
An alternative is to restrict the glitch by restricting ourselves from revisiting a level we already left by start select.
Chuck-Eat glitch (secondary) - Yes. With restrictions.
Obviously, credits trigger and exit counter overwrite is undesired.
Technical restriction, really: No overwriting special memory addresses. But outside of that, go nuts. I certainly won't mind seeing a "warp" take place.
"stun any sprite" bug - Yes. Unrestricted.
Can Mario be "stunned"? What about Yoshi? Message boxes? Moving platforms? Hey, you said
any sprite.
But besides that, anything that ends the level instantly through highly unanticipated means would be plenty good to see, by my initial thoughts.
All-exits - All 99.
When I think all exits, I mean all of them. Originally, I believed it to be 96, but now I am aware otherwise.
By this alone, a longer run that completes a new-found exit while still keeping a similar level of optimization on other levels should obsolete the older runs.
This has the side-effect of transmitting to everyone that, no, getting the goal sphere in Bowser's Castle through either route will not trigger the credits. Now go away.
Those are my thoughts.