Continuity mistake: In the flashbacks seen at the start of the film, Charles Nichols introduces Kimble to Alec Lentz. When this flashback is revisited later in the film, when Kimble breaks into Frederick Sykes' house, the words and actions of Nichols and Lentz are slightly different to what was seen earlier in the film. (00:04:15 - 01:24:55)
Continuity mistake: After the bus crashes, Kimble unlocks his hands and throws the keys onto the floor in front of Copeland. Two shots later the keys are lying in a different position when Copeland grabs them off the floor.
Continuity mistake: Kimble puts the worker's uniform on over his prison uniform, but when he takes it off to tend to his wounds, we only see him remove the worker's uniform, with no sign of the prison uniform.
Continuity mistake: When the Marshals go to arrest Copeland, they are in Whiting, IN. When the Sheriff's car comes through, it is an Illinois State Police car.
Continuity mistake: The prisoner starts foaming at the mouth and pulls the sharp implement from his sock, but when he is shot, he collapses back in his seat with no sign of the foam around his mouth.
Continuity mistake: When Kimble leaves the hospital and the detectives arrive, it's dark outside. However, when they're interviewing the nurse, you can see it's daylight outside.
Continuity mistake: When Kimble is on the moving train, Sykes mysteriously appears from a door when he wasn't there before. (02:00:00)
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.
Super Grover
Its a pneumothorax, is air trapped between the lung and the ribcage and it's very common.