Here are my thoughts on the episode:
I developed some serious love for Herschel in this episode. He definitely earned some bad *kitten* credit. He wanted to save everyone which I think goes back to how he had a barn full of walkers and thought that he could save them too.

I think I spent most of the episode yelling "please don't kill Glenn!!" He's one of my favorite characters and I'm glad that Herschel was able to save him. I thought it was gross that Herschel pulled the tube out of the zombie's mouth and put it into Glenn's but if I remember correctly I think he doused it with alcohol before to sanitize it as much as possible.

I'm still completely weirded out by Lizzie. The fact that she was playing with Glenn's blood at the end of the episode was completely bizarre. Also when she was leading the zombie away where did she think she was going to take it?? I'm glad that it ended up falling on her...that way she see's that they aren't the harmless pets she seems to think that they are.

I also developed some serious respect for Carl in this episode. Although it bothers me that he always seems to eager to get in the mix with the adults, he was there when Rick needed him and did what had to be done. There was a moment when Rick looked and him and seemed to be thinking that he hated putting Carl in situations like that but was glad that Carl was able to pull through.

I think there has to be someone on the inside feeding the Governor information. How would he be able to be that close to the prison without being detected. Granted they were otherwise occupied but I definitely think he's got a guy on the inside. In the previews the Governor seems much more sinister since he doesn't have a group of people that he has to pretend to be normal with. I'm curious to see if his two goons will still be alive also.