Audio problem: If you listen carefully to the conversation Kimble has with his lawyer, he says "St. Louis" differently in the live version and the police recording, indicating the crew may have used two different recordings.
Audio problem: When the cops are monitoring Kimble's phone call to his lawyer, Gerrard says, "That's a guy on a PA in the background", or something similar. During the actual phone call that Kimble makes, their is no PA audible in the scene at all.
Answer: Kimble is watching as the doctor, Al, looks at the chest film and states "possible fractured sternum, he's stable," and we can see Kimble's bothered by that. Then Kimble is told to take the boy to observation room 2. When Kimble questions the boy and looks at the chest film, Kimble ignores what he was told, and instead heads directly for the surgical OR. In the elevator he draws a line over the incorrect essential diagnosis: "depress chest w/ poss fr" (possible fracture), and begins to write "Ao," then he scribbles a signature on the Patient of Dr line. The essential diagnosis Kimble writes is presumably an Aortic trauma, which is a life-threatening critical injury and requires immediate attention. So when Kimble brings the boy to the OR (instead of observation room 2) for the emergency medical procedure, he tells the doctor the boy was sent up from downstairs. The child is then taken to operating room 4, STAT, saving the child's life.
Its a pneumothorax, is air trapped between the lung and the ribcage and it's very common.