Character mistake: When Dr. Brackett talks to the attempted suicide's boyfriend, he tells Brackett that the girl has already attempted suicide a total of three times, and the first time she was hospitalized, but a minute later when Dr. Morton reads the hospital records and tells Brackett that the girl attempted suicide the previous year and was hospitalized, Brackett then tells Morton that her boyfriend said that she tried it three additional times. It was just a minute earlier that the boyfriend said two additional times, not three.
Character mistake: On scene at the vehicle accident, John palpates a pulse on the driver's leg and tells Roy that he's got a good strong foot pulse. Then when Roy's on the line with Rampart we hear him say, "He has a strong fetal pulse," but presumably Roy certainly must have meant to say, "strong pedal pulse."
Character mistake: After Squad 51 joins Engine 51 at the heart attack incident, while Roy's on the Biophone with Rampart he sends a second EKG strip, and Early orders, "100 milligrams lidocaine bolus," but he mispronounces lidocaine and says, "Lidograin," then he pronounces "Lidocaine drip" properly.