Factual error: Ten minutes into the episode, where they're setting up their police-blockade, a cop makes a remark about being in some TV-show when Rick Grimes replies with: "Make sure you've got a round in the chamber and your safety off". Next we see the first cop checking his gun (a Glock) for a round in the chamber and we see him flicking his thumb across the gun's slide catch: not a safety-lever. Glocks don't have an external safety, so the cop cannot flick a safety-lever like in the episode. (00:10:10)
Continuity mistake: After Rick falls off the horse in the city center, he drops the gun duffel bag close to him near him at the rear of the tank. In the closing scene, the last five seconds, there is an overview of the street and the tank. But the black duffel bag cannot be seen.