Hey fawfulfan, I found 2 things in SWZ, first, if you get a shield before you get hit by the invinci-ray machine, and then it turns off, the shield remains invisible (I kept attracting rings with nothing, maybe rings think im hot? XD, and I tried getting another atraction shield later, it was still invisble (probably because its the same time of shield)).
Also, I got sigseved right when I was FINALLY about to pass SWZ 2, in the part where it rocket-launches you and you need to stay a bit on the "huge circly things" to make you not touch the deathpit.
But it doesn't really mater, I got sigseved a second before I touched the ground, wasnt ready for this sort of gimmick...