When the drunk driver is brought in to the exam room, his head is bandaged. Then the nurse cuts it away. Look closely in the ensuing scene and you will see the bandage reappearing and disappearing in the different angle shots.
No one in the history of the world has ever thrown a lit match into a toilet or on someone else's lawn.
In the opening scene of the car wreck the tow truck operator backs up to the wrecked car and begins hooking up to it while Johnny and Roy are still working on the victim in the car. The cop at the scene should never have allowed that. Even after the man was extracted from the vehicle the accident investigation would take some time, the tow truck operator would be made to wait until the investigation was over before he could tow the car away.
After being shot at, Johnny and Roy repel down to the ground. Johnny goes first, then Roy follows, but he leaves the drug box on the scaffold, and it is not brought down from there before they leave.
After coming down to the roof from the scaffold, Roy and John are carrying the patient in a stokes basket. Roy says they'll have to get the patient down below (to the street) and notify the hospital. Captain Stanley notifies the dispatcher that Engine 51 and Squad 51 are available. The Squad is not available because they haven't contacted the hospital yet and they have a victim with a gunshot wound.