Oh, one of those common “please take down our copyrighted content or prepare to be sued” mistakes. We’ve all made those. I’m pretty sure the only “error” was underestimating the pushback.
So, all’s well that ends well, I guess, except for that fact that Comcast’s “error” nearly took a site offline and gets to walk away from the experience unscathed. And because it made it through with little more than some public embarrassement, it won’t learn a damn thing.