More of a nitpick, especially with the problems are having. But why do they call them zombies? In both the comics and TV series they are never called zombies.
The idea is that in the universe of the walking dead the concept of a zombie has never come up. Which is why they call them walkers (or whatever names they come up with).
While calling them walkers would be the same as what the main group does, I would have still prefered that then calling them zombies. But the voice acting is likely done, and it's too late to change anything.