Finishing a chapter won't terminate the quest you started in it.
The area where you need to take the accorn will be open when you start another quest. *Hint* Go look in the cooper coronet.
As for the graveyard, if you wait too long, or if you pay the money to the thief, you won't be able to have the graveyard encounter. But never mind that. It is not important to see it.
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Once upon a time in Canada...
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