My Boss's Free Haircut - S4-E20
Continuity mistake: Dr Cox asks Dr Kelso the last time he looked after a patient and it flashes back about 20 years, but in the episode "My Karma" (season 2) Dr Kelso gives Elliot his patients to take care of.
My Boss's Free Haircut - S4-E20
Continuity mistake: After Elliott falls into the grave, she tries to pull herself out by placing both hands on the edge of the grave and jumping. When she falls back in again, there are two clumps of dirt missing from the edge where her hands were. In later shots, the edge of the grave is unmarked.
Answer: Dan was drinking beer and Cox feared that Dan might get so intoxicated he would fall asleep and drown in the tub.
Mortug