My Old Friend's New Friend - S4-E1
Continuity mistake: When JD writes 'Al Coholic' on the shifts board and the shot then cuts to Elliot, there is a brief cut back to JD and you can see behind him that his prank name has changed to 'Dr. Ass Face'.
Continuity mistake: At the beginning when Dr Cox is talking to Dr Kelso, behind Dr Cox is a women handling a green stuffed toy which she puts down. The shot then cuts to the son and wife of Dr Cox and then back. The woman has the stuffed toy back in her hands.
My Old Friend's New Friend - S4-E1
Continuity mistake: At the end, after Carla and Turk drive off in their new car, JD is on his scooter and there isn't a chain attached to its rear. But when he drives off there is.
Continuity mistake: When JD is trying to make a point to Turk about Turk hitting him much lately, Turk raises his fist about to hit but stops and we see his hand is closed. It cuts and his hand is open, and cuts back to being closed.
My Boss's Free Haircut - S4-E20
Other mistake: When Bob is trying to get into the patients room, he uses a screwdriver to break in. The door opens into the room with the hinges on the inside, theres no way he could get at them and the door frame is intact as shown when the door falls in.
My New Game - S4-E3
Continuity mistake: Right near the beginning, Jordan adjusts Cox's stethoscope and collar. The end of the stethoscope then goes back and forth between inside and outside of his coat for the remainder of the scene.
Continuity mistake: When Kelso flies off the tread mill, banging into the wall and making the book shelf fall on his head, the books falling to the floor change position in the next shot.
Continuity mistake: When Carla and Turk tell JD that he is around them all the time, it cuts to a scene with Carla and Turk in the tub while JD is using the toilet. It cuts back to JD saying "And here I thought that was a lovely evening" while he is holding a bowl of popcorn in his hands. When it cuts the bowl is suddenly on the table.
Visible crew/equipment: When JD and his date are riding in the car, JD runs over something. When they stop the car to see what it is you can see a kneeling crew member reflected in the side of the car.
Other mistake: When Turk is squirting cream on to the pancake to make a face, we hear 3 squirts which wouldn't be enough. The eyes are X-shaped and would take 2 each plus the smile would have taken a longer squirt.
Continuity mistake: When the woman in the tub comes crashing through JD's roof the pieces of wood around her change position between the shots.
Continuity mistake: When Jordan slides on the floor going under the closing door her hat goes off landing straight, and already beyond the door. When it cuts to her picking it up it lies on its side and is now on the other side of the door, for her to reach under and collect it.
Revealing mistake: When Dr. Cox is duct-taping Dan to the bathroom wall, you can see that the tape across Dan's forehead is already stuck before Cox sticks it.
My Boss's Free Haircut - S4-E20
Revealing mistake: When Carla and Elliot are walking through the graveyard, Elliot falls into an open grave. After she has fallen off the bottom of the screen, you can see her ankle flick up in the bottom of the picture, showing that she actually just fell down on the floor during shooting.
Continuity mistake: When The Janitor and Kelso sits at the bench and Kelso gets up and walks away the bench has straps attached to it lifting it up. The straps weren't there earlier.
My New Game - S4-E3
Continuity mistake: When Dr. Cox gets to Molly and she says "I gave you every opportunity to do the right thing" she covers her mouth with her hands. It cuts to behind her and her hand is down.
My Ocardial Infarction - S4-E13
Continuity mistake: At the end of the episode when JD sits down at the table with Elliot, who is eating, Elliot puts her fork in her bowl. When it cuts, the fork is on the tray.
My Unicorn - S4-E11
Continuity mistake: When the girls are in the canteen, one shot of Jordan shows Elliot's drink in front of her, before Elliot has sat down with her tray.
Answer: Dan was drinking beer and Cox feared that Dan might get so intoxicated he would fall asleep and drown in the tub.
Mortug