Continuity: Episode 23 - season 4. 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.

Continuity: My Lips Are Sealed Episode Number 89 Series number 4 When JD is brushing his teeth and then finds out that his brother is in the bathtub the amount of foam around his mouth changes.

Continuity: 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: 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.

Audio problem: When JD jumps onto Turk and they yell at each other, you can hear JD say 'Giggle' or something, in a high voice. But his mouth does not move when this is said, plus he is already screaming in delight, so he couldn't have said it.

Continuity: The man in the horned helmet gets off JD's scooter and steps onto the pavement. In the next shot as JD rides away, the man has suddenly vanished.

Continuity: 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: 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.

Continuity: When JD and Turk are trying their latex suits Turk has a black scarf around his neck. Then JD says "You're mad because I make more money than you.", Turk turns around and the scarf is gone.

Continuity: When Kelso swaps Carla and Turk's coffee mugs, the handles are both facing towards the camera. In the next shot, they've moved round with no-one having touched them.

Revealing: When Dan is in the tub you can see his dark swimsuit in a few shots.

Continuity: 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.

Revealing: 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.

Continuity: When JD is sitting with his brother while his brother is in the bath tub, the three beer cans behind JD change position during the shots.

Continuity: When Carla turns down the job offer from Kelso the second time there is a pen lying on the table. In the next shot Carla suddenly has her hand on the pen.

Continuity: When JD and Nina are kissing at the end of the episode, the direction in which JD tilts his head changes twice, when the camera reverses on itself.

Other: 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: When Jordan wets Elliot's scrub the stain on the scrub differs between the shots.

Continuity: When Murray is flying the plane towards JD, JD is stood on a dirt surface with a road and his scooter behind him. When JD starts running from the plane, he is in the middle of a grassy area, with no road or scooter behind him.

Continuity: 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.