My Last Day - S1-E24
Visible crew/equipment: When Dr. Kelso is walking and talking with J.D. and Dr. Cox, notice the glass with the Zofran poster in back of them. You can see the camera guy, boom mic and a crew member with the white shirt walking backwards. (00:15:10)
Answer: Dan was drinking beer and Cox feared that Dan might get so intoxicated he would fall asleep and drown in the tub.
Mortug