Yep, u can miss a lot. I know there are three areas in spell I didn't explore either - The gem mirror (although I think I found the right gem to open it), the 12 items in the 12 hands (I messed up and lost patience), and the door where the vampire that sends u on the shard quest.
I also only did a few things in chap 6 - I wanted to leave all the extra forrests for my second time through. There are so many quests, you can actaully play this game twice and be surprised!
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