In the original Zelda things were wildly different on your second 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.