Cyndie runs out of ammo and her rifle 'clicks'; on the AR-15, the bolt locks open after the last round is fired.
Heath and Tara find a pile of dust on a bridge. She tries to pull a bag out of the pile when it collapses and they both fall on the floor. While some walkers are crawling out of the dust, there is one that magically appears standing next to Heath.
When Tara is discovered hiding by the shed and makes a run for it, the muzzle flash from one of the survivors' automatic weapons indicates she is being shot at whereas the gun noise does not match up.