When Harvey Dent is in the hospital being taken on the stretcher down the corridor, a doctor wearing glasses has red (strawberry blonde) colored hair. In a close-up shot, his hair turns black. The doctor's hair goes back to red before Bruce Wayne appears.
When Harvey Dent is in the hospital being taken on the stretcher down the corridor, he is wearing an oxygen mask but the tube from the mask leads to a med drip with liquid in it.