At the bottom of each page is a link:
If you find inappropriate content, please report it to Barnes & Noble
I tried using it to report inaccurate description on one of today's free entries (Legend of Sleepy Hollow has only a single short story, but the description has a Table of Contents for a full short story collection). A pop-up box appears, titled "Why is this product inappropriate?" However, when I select a category (Inaccurate description), type an explanation, and click "Submit," it just hangs. I've tried it in both IE and Firefox.