In the 11th measure of the Mayor's Office, the A is flatted, but shouldn't it be a natural?
Yes, you found an error.
Not worth a topic though.
One misplaced accidental =/= brand new topic.
Well, tbh, we don't really have a topic for this. The closest one would be this (http://www.ninsheetm.us/smf/index.php?topic=5416.0), but it's mostly for technical stuff.