Rick's lost it. Is the woman he saw Lori? Lol I couldn't tell because of how crazy he was going.

Him and his hammer VS Countless Walkers when they lock him up and he somehow survives and kills them all.

I imagine they'll return to the Prison in the next couple of episodes. Just substitute the reason for his breakdown. Maybe his sister takes the role of his daughter or something in the comic book context. I hope they keep it in anyway, perhaps it's more hope than objective thinking on my part

I love the development of the several different groups. We had Woodbury, Rick's Group, the group at the Prison, Tyrese's group and the Dixon brothers

The part in Woodbury's meant to convey a message that the series as a whole makes clear; you have to change. If you become soft and get used to the safety in a community, you're going to die. Sounds contradictory, but the fact that things are unstable at the Prison means that they're much more likely to survive; they're always on their toes, there's no real 'down time'.

If a guy who had led you for an entire year started to yell, shout and get his gun out on your group, you're not going to suddenly 'take charge'. All of them were confused, unsure of what to do. Sure, they had numbers, but they knew that if they didn't comply with what Rick was yelling about, at least one of them would get shot by him in his craze.

I loved Andrew Lincoln's acting here. Perfectly realistic reaction to seeing Lori, especially in a wedding dress, if it was that. He was in a firefight in which he had to kill a few people, he thought he'd seen Shane, he'd seen Oscar die and after Daryl left, he had to worry about what the group would do without him. It all built up and, along with his continuing depression about losing Lori, manifested into the hallucination.