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.
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.
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: 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.