Factual error: The police "clone" the cargo dock's computer, as though it were a cell phone, so that they can watch all the cargo traffic and see when containers disappear. In reality, to "clone" a computer would simply make an exact copy of that computer's hard drive at a specific point in time. In order to see what is happening on a specific computer in real time, it is necessary to install some sort of spyware on the target machine.
Continuity mistake: In the scene where Omar walks through some alleys on his way to stick up a corner crew, he is first observed carrying a double barreled shotgun with a wooden butt. A minute later, when he emerges from the alleys and dumps the drugs down the sewer, he is seen carrying a metal pump action shotgun.
Question: What does ISD stand for in Baltimore police? It is mentioned by major Colvin to Carv after police officers correctly guess that somebody (Carv) has moved the dead body (Internal affairs is called IID during the show). It is mentioned again in Season 4 episode 8, when Herc worries about how to get back an expensive camera that Carv helped borrow to that ISD department.