I also don't get why Rick/Daryl/Merle have that stranded look on the outside. The fence was breached and there are now what 10-15 zombies between the interior and exterior fences? Heck, they took out more than than saving Rick! I don't get why they didn't immediately run back around to the interior fence and kill off everything that got through, then try to plug up the holes in the fence? The longer they wait, the worse that's going to get.
I took the last shot as being symbolic of how fractured/separated the group is becoming. The longer they stand around and wait to fix it - the worse it's going to get......
On another note - besides the great things that everybody has brought up - there is a little thing that has been bothering me. In the previews for this week's episode Carol is talking to Daryl about what a bad influence Merle is on him. I like the relationship Carol and Daryl are building - albiet slowly - I just hope she doesn't turn into Lori and start nagging and harping on him about Shane.2 I like the way Carol has come into her own - I hope it's handled well - she usually has a good way of talking to Daryl.