It was a better episode than most of late, i hope they stick with the road.
Thing for me isn't the plot holes, it's the terrible basic writing when they try to convey any real depth like emotion. I mean samurai's breakdown and recover (and the most horrible tear face ever) was just all so predictable and tired. They are shit writers at anything like that, so stop trying to make us care about the extremely dull characters, and give us more zombie situations! I just don't care about a whiny little brat, or the fact the characters can recover from mental breakdowns as soon as the scene switches, I just want to see more of them just trying to survive.
Oh and if it was that easy to survive a horde of zombies, just go into rampage mode, they should have all done it at the farm. Don't get me wrong I'm glad that place burned down, but these rages seem powerful stuff.