Surprise Difficulty: The veteran Zelda gamer should have little to no difficulty conquering the dungeons and their respective bosses, until the final boss Vaati. He has multiple forms with unique attacks that all hit like a tank. Needless to say, without a strategy guide, you're going to die a few times trying to work out each form's weakness to which item.
That One Sidequest: The cucco game. The cuccos you must find only appear when you start the game, idiot villagers will always get in your way and stall you, and there's very little time to complete the challenge even if you know exactly where the cuccos are. Not to mention some of them are on roofs and unreachable, and there are times when you won't be able to pick one up even if you're standing right next to it. You'd better get used to Anju saying "Hmmm. Well, it looks like I'm still missing a lot of cuccos..." because you'll be seeing that a lot.