I'm thinking the "other exhibitor" might just be glad to have you "out of the way".... why get your dog's points taken away and have to continue competing against your dog? Sometimes its better to let things ride (when its something like that).
Hi "JustWondering":
It happened to me, my bitch had some incorrect information on her entries, and I only noticed this on her last show where she took her championship. So I notified the kennel club and explained the situation, and they appreciated it and didn't take her championship away.
So you could call AKC to cover your butt, and explain the situation or let it ride and see if anything happens. I would be careful though, addressing this on a public forum, she might be watching.
Good luck