Park is wearing the same shirt when he tells Morgan not to resign and in Lea's hospital room, but Morgan is wearing something different between those two rooms.
The first view of the ambulance has it moving at night in dense fog, but it's morning when everyone is gathered in the E.R. for ambulance arrivals after the crash.
Dr. Kalu tells the ambulance driver at least five more ambulances are needed before he assesses how many injured people there are.