Biggest error I read was where NV has a duty to retreat. I see several commentators correct him on it, though.
I read him saying that open carry was not illegal. But it was in a context that made it seem like he thought it was. He got clarification on that in the comments, too.
Too bad he took the class at The Gun Store. I'd have worked around his schedule, and given him accurate information at the same time, without boring him.