Revealing mistake: The patient Dr. Kelso says is dead is actually breathing while lying there in the bed. (00:06:25)
Continuity mistake: When Carla enters through the window look at J.D's water bottle, the Dasani label is visible. However, when they cut back to Eliott and J.D. the label is now blacked out. (00:12:15)
Answer: Dan was drinking beer and Cox feared that Dan might get so intoxicated he would fall asleep and drown in the tub.
Mortug