I was going to edit this question but I appear to be running into some kind of spam catcher.
The phrase "The Walking Dead" was blacklisted a few months ago after a wave of spam. Unfortunately, it's not feasible for us to differentiate between new posts and edits when it comes to checking for blacklisted stuff. If nothing else, if edits were exempt, it'd make it easier for someone to edit blacklisted input into posts that didn't previously have it.
Either way, the last time this phrase was matched by an actual spam post was about 4 months ago, so I removed the blacklist entry.
We're working on other (and better) means of dealing with spam, so if another wave comes we should be fairly well-equipped to handle it without needed to resort to blacklisting input again.