In addition birds can be flagged for time of the year. A really common Yellow-rumped Warbler isn't a big deal, unless it is in the middle of winter in the North. Then it will be flagged. They also will often crank up the filters during the Backyard bird count. That way someone who participates and sees a Red-bellied Woodpecker, and calling it a Red-headed, can be flagged and asked for more clarification. They can also be flagged for a hight count. Dunlin appears on my checklist, but when I put in 25 of them it flags as a hight count in my inland county.
My advice if your bird isn'