Kima Gregg is now "recovered" from her injuries, but clearly shows no scar on her neck from the tracheotomy that was to have been performed in the ICU, at the end of the first season.
When Stringer is talking to Bodie and Shamrock about the detour they had to take in Camden. Idris Elba's English accent can be heard.
When Bodie and Shamrock are driving back home to Baltimore from Philadelphia it appears that they are driving on a highway in or near a city there's a mile marker sign that says "Havre de Grace 3 mi Baltimore 40 mi". This would place them around Perryville MD which is a more rural setting on 95.
A boom mic is visible when Beadie enters the container for the first time.