When McNulty is walking with Kima and discussing No Heart Anthony, the way he carries his folder switches in between shots.
Lester Freamon says he was transferred to Pawn Shop Detail in 1989 after arresting the son of an editor at The Baltimore News American paper and forcing him to testify. The Baltimore News American ceased publication in May of 1986.
When Pryzbylewski's word search puzzle is shown in close up, the words that are circled already can be seen to be gibberish and not actual words.
When Polk tells Mahon, "That kid did you a favor," his mouth doesn't say the same words.