This was pretty well done. The Zombie disguise sequence was very suspenseful, with the ominous rumblings of thunder, followed by the rain (although it did end pretty quickly and conveniently). The Zombies seem to have an eerie intelligence sometimes. And some of them can really move if they want to; I hope they don't overdo that.
I loved the scene where they took time to recognize the identity of the guy they had to chop up.
The last scene with Glenn on the highway was hilarious. Although I find it hard to believe that the inbound lanes would be empty like that; lots of people would have tried to get out that way, too.