Part of Rick's reason to return to Atlanta, besides looking for Merl, is to retrieve his bag of guns. In fact they almost have a shoot out with the other group over the bag of guns. Yet, throughout the downtown dozens of machine guns and holstered pistols can be seen on dead soldiers and several M-60s can be seen sticking up from the sandbags. No one seems too interested in those guns?
Previously, it was a minor plot point that there were no manholes in the alley next to the department store. In this episode, Daryl knocks down one of the Vatos in that same alley and he lands right on top of a manhole cover.
Once Shane tackles Jim, pinning him down after he is digging holes, Jim expresses what had happened to his wife and sons. In this shot, we see him pinned down to the ground, his hat knocked off. But in the next shot, Jim's hat is back on his head.
It is often said that the presence of manholes in the alley where Glenn is taken by the Vatos is an error. In Episode 2: Guts, Glenn is asked to look in the alley and see if there are manholes and he says no but this is not the same alley. When Glenn helps Rick out of the tank and they climb the ladder to the roof they go across a bridge and down into a different building.
The shotgun Rick has while confronting the Vatos is not a fake, it's a Mossberg 500 Persuader, a shotgun commonly used by law enforcement. It does in fact have a trigger, Rick's finger can be seen resting on it, though it is hard to see due to the fact that the trigger rests almost all the way back against the trigger guard when cocked, this is one of the reasons it is favored by law enforcement because it has a hair trigger.
The alley by the tank where Rick first met Glenn is not the same alley that was next to the department store, the alley that Glenn said had no manholes. As Glenn says when going over his plan to get the bag of guns the alley by the tank is five blocks away from the department store, in fact the two alleys look nothing alike. So there was no mistake made on the part of the show in terms of manholes as was incorrectly pointed out in a previous goof.
In several close-up scenes of Daryl with the crossbow, you can clearly see that it's not loaded correctly. The nock of the bolt (arrow) is resting well above the bow string and no way would it fire properly.
The goof item below may give away important plot points.
When the grandmother appears during the stand-off, Rick lowers his rifle towards the ground, away from Guillermo. In the next shot, there is a jump-cut, as the rifle is suddenly back up, pointed at Guillermo again. We then see Rick lowering the rifle a second time from a different angle.