In the original zelda things were wildly different on your 2nd playthough, I always wanted to but never managed to keep a NES/zelda cartridge/battery long enough to go far enough past a 2nd playthough to look for more cool changes.
Did I miss anything?
I could swear before I was old enough to really remember I saw something before I got the NES or zelda at someone's house that I never found playing it through about 2.5 playthroughs.