Audio problem: When detective Bryant gets rough while interrogating the suspect of the shooting he tells him to sit down. When we cut to a different angle we hear him repeat the last few words of his sentence.
Continuity mistake: Adams and Ochoa are in a factory trying to find the shooter with a machine gun. Adams is significantly ahead of Ochoa in the stairwell, yet, when they enter the floor Ochoa is in the lead.
Continuity mistake: In the opening scenes Adams is in bed with her patrolman boyfriend. She is on his left and says we need to talk. In the next camera angle Adams is now on the boyfriend's right side.
Continuity mistake: Near the end of the episode when a gunman enters the precinct house and starts shooting, Sammy dives for cover and begins looking for his gun in his duffle bag - twice.
Underwater - S4-E2
Continuity mistake: Sammy Bryant has been a three stripe Sergeant throughput the series. In this episode's roll call he's wearing two stripes.
Revealing mistake: In the scene where Cooper takes the homeless man's photo on his iPhone, if you look to the bottom left of his iPhone's screen where it shows pictures that you have already taken, you can see that the homeless man's photo has already been taken, indicating that perhaps this scene was shot a few times, and the photos taken during those scenes were never deleted.
