I stumbled upon this last night and though I'd share. Don't know if it's been posted here before.
The page I linked shows an early "prototype" version of the game and compares it to the final Famicom release. At the top of that page is a link to thier main LOZ page, which shows the differences between the Famicom release and the NES release.
It's interesting to see the changes that went on in the game's development.