Looks like you found the extra tree but it is a variety, not an error, big difference.
Here is an explanation on what to look for on the 2005 extra tree variety. "Look for a small extra tree literally floating in the sky next to the fourth evergreen tree to the right of the state outline"
Definitely looks like it, congrats on the find. =) Could you post full coin pics, both obverse and reverse?
For whatever reason, there were a large number of DDRs for the Minnesota quarters. It might be madness-inducing to try to identify the specific doubled die, but it might also be good practice.
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