 In the first episode of season four, "My Old Friends New Friend",  J.D. writes the name "Al Coholic" as a joke on the white board used  to assign shifts for nurses, then he turns to talk to Elliot.  Seconds later, in the next shot, the white board can still can  briefly seen behind J.D. as he leaves the room, but the name has now  changed to "Dr. Ass Face".