Harm subdues one of the terrorists with a defibrillator on a wet floor. Defibrillators only work by pressing the buttons on the paddles to deliver a stored charge, not by simply throwing the paddles onto the floor and delivering a sustained jolt.
As Harm is active duty military if he needed to be admitted to the hospital he would be transferred to Bethesda Naval Hospital, military members can be treated by civilian doctors in an emergency, like in an ER, but any further treatment requires a PA from their health insurance, which can take a few days, which is why he would be transferred to Bethesda Naval, which is also in Washington DC.
Mac asks the surgeon if the anesthesiologist could vent some of the gas being used to keep the patient asleep into the room to knock everyone out. Anesthetic gas is only used in small amounts to put a patient out while the intravenous anesthetic, usually Propofol, takes effect. Once the IV drug takes effect the gas is no longer used, and it would need to be concentrated inside a mask to have an effect, venting into a large room would have little to no effect.
When one of the terrorists is searching for Harm the action on his Uzi is open and you can see a round sticking up out of the magazine. In fact the action is more than just open, the bolt is missing entirely, indicating it is a prop gun.
The reason the helicopter delivering the heart says "CareFlight" on it is because the donor heart came from a hospital in Dallas, Texas.
Mac (Catherine Bell) talks in Farsi (Persian) to a character who is identified as an Arab. Very few Arabs understand Persian, though there is an Arab minority in western Iran. The 2 languages are very different from each other.
The Israeli minister's heart is delivered by a "CareFlite" helicopter. CareFlite is an air ambulance service in Dallas, Texas, not in Washington DC, where the episode takes place.