Character mistake: When Dr. Brackett is showing the paramedic trainees the defibrillator and how it's used on a patient, Brackett places the paddle electrodes on the Defib tester to display its effectiveness, and says, "Eyes on the V-fib tester." However, it's not a V-fib tester to test for ventricular fibrillation, it's a Defib tester, testing the effectiveness of the external defibrillator's electrical shock.
Other mistake: When the plane crashes into the neighborhood and traps Gage and DeSoto in the house, you see outside shots of the squad when the other two paramedics arrive. You can see a large piece of smoking engine/plane laying on the back end of the squad, right over the spare air tanks. They would have exploded when something that heavy and hot landed on them, since they are filled with oxygen. The tanks would be full or they would not be on the back of the squad.