Continuity mistake: While Dr. Cox is explaining to JD why he allowed the patient to worsen, the remaining "man" card in the pocket of JD's scrubs raises and lowers between shots.
Continuity mistake: In the intro, JD comes running back into the shot after trying to change out of the same exact outfit Dr Cox is wearing. JD has the "Baby Gap" TShirt stuck & wrapped around his head turban style. The shot switches to over his shoulder and the shirt is now loose, like a towel wrapped around his head.
Answer: Dan was drinking beer and Cox feared that Dan might get so intoxicated he would fall asleep and drown in the tub.
Mortug