*Note:* Some screenshot I'm using cheats to power-up Mario, nothing more. And sorry I'm not giving the level names. I'm just a bit lazy right now, sorry. One more thing, I used Paint to make circles and arrows in some screenshots.
And now, let me explain a little more on #2:
2: Palette Glitch Explanation
The pictures should explain it all,
#1: Where the Shyguy was, #2: Where I brought it, and #3: What happen to the palette.
3: Graphical Errors
turns into a dead one:
This... is highly unlikely, only because you would not carry a Buzzy Beetle to this area, it's just too much work, you can fix it, but you also don't have to. Plus the green pipe isn't all fancy like it is in the other ice-type areas.
5: Other strange happenings
You can get an infinite amount of fuel, because the can never disappears.
Now I get five more cans after the first one, and it doesn't let me pass! Now I have to kill myself...
Unbreakable Spin Jump Freedom Glitch
You could use spin jump to get to the ledge, only because you maybe forgot the springboard at the beginning and don't want to go back, and this might happen.
That's all I found... So, it's still a very good game, no matter what glitch it has. Good job on the game.