Continuity mistake: When Dr. Cox is examining Ben, he has his hands on his face. The shot cuts to another angle and Dr. Cox's hands are by his side.
Continuity mistake: When Carla, JD, Turk and Elliot are in the canteen, JD's drink changes with Elliot's by the end of the scene.
Continuity mistake: When JD is giving Ben the bad news of his diagnosis, Ben's arm can be seen held down by his knee in one shot, and in the next it is instantly behind his head.
Continuity mistake: When Elliot is crying to get her own way, her hair changes from hanging loose to tucked behind one ear, and back again.
Answer: Dan was drinking beer and Cox feared that Dan might get so intoxicated he would fall asleep and drown in the tub.
Mortug