Continuity mistake: Carla's about to eat a piece of steak. In the next shot she's holding her wine glass without enough time to change them. (00:19:25)
Continuity mistake: When JD is talking to Eliott in the cafeteria, his straw in his orange juice changes direction between shots.
Continuity mistake: When J.D. and Eliot go bungee jumping, they go past a large pipe, or something on the way down but, when they bounce back up, it's gone.
Continuity mistake: During the scene where the class is being warned about the dangers of being a "wait and see" type of doctor, JD imagines himself as being the only person in the auditorium. In the first shot of him alone, there is a bookbag (or something similar) sitting on a seat about three seats to JD's left. In the next shot of him, it is gone, and in the third and final shot of him alone, it is 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