Reformation - S3-E10
Visible crew/equipment: During the opening sequence when two hoodlums are walking out of the convenience store, a lighting rig and crew can be seen on the right-most part of the frame. (00:02:15)
Visible crew/equipment: When Carcetti arrives to see constituents complaining about their problems, the tip of the microphone is visible in the upper left corner, as well as the man holding it. (00:37:10)
All Prologue - S2-E6
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.
Det. William Moreland: You seem awfully happy today.
Det. Ray Cole: I got laid last night.
Det. William Moreland: Oh yeah? Your asshole still hurt?
Chosen answer: As he's trying on his new hat, Valchek says, with a smile, "fits like a glove!"