Corrected entry: Rick gets shot in the high left shoulder/chest. He wakes up in the hospital with a gun shot wound to his side.
Corrected entry: At the start of the episode Hershell is seen beheaded and Michone finishes him off - the only problem is Hershell was not beheaded by the Governor at the end of the last episode, and Hershell managed somehow to crawl away.
Correction: While in the mist of all the shooting and killing Tara's sister Lilly rolls up with a dead Megan in her arms, the governor takes her and shoots her in the head to prevent from her turning, then goes back and finishes off Hershel, decapitating him.
Correction: The governor then finishes the job. You even hear someone yell "he just chopped that guy's head off, with a sword!"
Revealing mistake: When Aaron is pinned down by the sewer zombie, the zombie actor's neck can be seen below his head mask.
Suggested correction: I went back and watched this scene several times, and I think the OP is mistaking Aaron's hand on the Walker's neck as the gap in the mask.
Character mistake: While Hershel is sitting at the bar talking about what happened at the barn, he tells Rick what he was thinking about as he watched Rick run across the field, carrying Carl, who'd gotten shot. But it was Maggie who'd witnessed this through binoculars, and then yelled for Hershel.
Suggested correction: And he came outside to see Rick running across the field with Carl. No mistake.
Revealing mistake: When Morgan stabs the walker which is hanging from The Tower, the blade enters its lower head, but the blood can be seen coming from above the hairline. (00:25:30)
Suggested correction: I can see where the confusion is. If you watch it normal time, it looks like he stabs him in the cheekbone. But in slow motion, you can see the blade go into the top of the skull.
Pretty Much Dead Already - S2-E7
Revealing mistake: When Shane lets loose on the gang at the barn about the two walkers Hershel and Rick just brought out from the woods, he fires several shots into the female walker's torso, as he screams at Rick about them not being human. Then subsequently fires two shots at her head. Yet she is still moving when she should have dropped. As ANY blow to the brain kills instantly. But she doesn't drop until Shane dramatically moves right up to her and shoots her in the forehead.
Suggested correction: Those two shots were actually into the torso. He fired three into the torso, paused, two more into the heart and lungs, paused, then two more into the torso before he put one in the head.
Correction: He gets hit twice.