A decent episode.
I'd read about the Eugene twist long ago, so the "highlight" of the episode wasn't a huge surprise for me.
Abraham's family seemed to be pretty short-sighted running away from him, but it seems like they'd been through hell in the supermarket while Abraham was away. I did wonder why his family hadn't become zombies. Did someone come along and kill their zombified versions very quickly after they turned? Or if zombies eat enough of your flesh, do you not turn into a zombie? Or maybe Abraham just found them before they turned, although if they'd only been recently attacked, then I'm surprised that there weren't more zombies feasting on them.
I was also a little surprised by how easily zombies now "fall apart" thanks to water pressure. And how losing substantial amounts of flesh seemed to permanently stop zombies, despite the fact that their "brains" were still functioning. I guess that no flesh, means no muscle and therefore no means to move.
Finally, it seemed odd to me that everyone was using fairly small knives to kill walkers since that required that to put their hand/arm very near the mouths of zombies. I understand that they probably have limited weapons, but wouldn't a sharpened wooden stake be a more effective weapon since you could keep your distance more easily. It seems that zombie skulls are particularly weak, so I would have thought that a wooden stake would break through the skull to the brain somewhat easily.