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2) You don't unlock the original game just by completing the Sands of Time.
3) In order to unlock the original game, listen carefully:
After you get the 1st sword upgrade and break down the first wall into the ancient palace that the newer one was built on. Go across the first room until you get the that switch you turn around to open the door - the door into the barracks where you have to fight a load of monsters.
Right behind the switch is a wall - hit it lots with your new sword (it doesn't look like the normal walls you can break down), go inside and it'll show a message telling you the original game has been unlocked.