Here's another thing my son and I were discussing: Why call them "walkers" and not zombies?
Why make up a name for something everyone already knows about? I mean, I assume this doesn't take place in an alternate reality where the concept of zombies has never arisen ... there's never been any zombie movies or whatnot.
If this shit went down today, we'd all be running around screaming "ZOMBIES! ZOMBIE APOCALYPSE!!!!!!", no? Maybe we'd shorten it to Z's or Zeds or something. But why invent a descriptor?