In the very last shot of the episode, after learning that their investment opportunity has been lost, Chet, John and Roy are in the poses of the famous "Hear No Evil, See No Evil, Speak No Evil" tableau.
When they are in the treatment room with the guy with a heart injury, they cut to a close up of the ventilator and it clearly says Bird Animal Ventilator. And at the roof fire when they are lifting the ladder on the rig, you can see that they probably hit the vent hood of the building in a previous take.
In the pilot episode Dr. Brackett Robert Fuller is identified as being a thoracic surgeon and Dr. Early Bobby Troup is identified as a neurosurgeon with his own practice.