So what was the significance of the lone zombie in the field? Was Shane relating to it, thinking that he needed to be on his own? That point went over my head.
Also, the first time we saw the zombie in the field was when they were driving out to drop the guy off. So when driving away from the farm, the field was on the passenger side, with the zombie walking in the direction they were traveling. Then later, they're headed toward the farm, but the field is still on the passenger side, with the zombie walking in the direction that they're traveling.
I'm sure it's a fluke, but just something I noticed.