Continuity mistake: Near the beginning of the show, when Elizabeth and her mother are having tea before they both go off to work, for a couple of shots from in front of her, Elizabeth is holding the mug with both hands, but the shots from behind her show her holding it with one hand only.
Greene with Envy (a.k.a. Lawrence of Northwestern) - S6-E3
Continuity mistake: When Dr. Lawrence is working on the ER with Mark, he gets frustrated because the tag Kerry's issued to everyone gets in his way. He asks someone to get it out of his way, and as he moves around to the other side of the table, we can see it has been pulled up around the back of his neck. As he reaches the other side, it is suddenly hanging straight down again. A short time later it is tucked up around his neck again. At no time did he adjust it.
Masquerade - S5-E5
Continuity mistake: When the med students throw the burning armchair over the balcony it tumbles down the steps, crosses the landing and continues to roll down the second set of steps to within a foot or so of Carter and Bernie. The next shot shows it on the landing again, and then tumbling down the last few steps again.
Continuity mistake: When Jeanie and Al are in the diner, when she spears a piece of fruit on her fork, Al has his hand on his hip. However, when the shot changes and she says, "How about your grandmother?", his hand is up on her shoulder.
Continuity mistake: Dr. Hicks is standing in front of the surgery white board talking to Carter and she says "Care to join me?" He replies "Love to" and the shot goes right back to her - she has moved 8 or 10 inches to the left, without enough time to have done this in real life.
Continuity mistake: Carter makes an upward motion and grabs Angel's paper cup of booze from her - but in the next shot there is no sign of the cup and he is holding a clipboard. There was no time for him to get rid of it.
Continuity mistake: Carol's notary asks her for some water and she takes the cup in one hand and the jug in the other and pours. The next shot shows one hand still pouring and the other up on her papers. She had no time to put the cup down and move her hand.
Random Acts - S3-E20
Revealing mistake: When Dr. Greene is being attacked in the toilet, he is thrown into a supposedly brick wall. It bends and wobbles like a set wall would.
The Healers - S2-E16
Plot hole: When Benton and Carter are having to do the surgery on Raoul in the ER after he was burned they are not wearing masks.Dr Greene had just said that the real cause of death in burn victims is infection and not the burns themselves.
Other mistake: When Jodi O'Brien is having seizures during the birth, Dr. Greene decides to take the baby out prematurely. Complications result and the woman dies, they show a shot of a clock in the background and it says 7:00, but when they say the Time of Death they say 6:02.
Continuity mistake: When Carter enters Mrs. Connelly's room, we should still be able to see Lucy who was just talking to him outside the door. But when the shot shows him entering the room, there is no sign of Lucy.
Revealing mistake: Near the beginning of the show, Mark's father puts a bulb into an old slide projector. Then there is a small explosion with smoke and flames - watched carefully, we can see are actually coming from the other side of the projector - the flames can be seen shooting parallel and close to the floor, which wouldn't have happened if the explosion actually came from the projector.
Continuity mistake: When Carol and Carter are discussing the overdose patient with nurse Dory, Carter's crutches change position and then return to their original position, even though no one adjusted them.
The Peace of Wild Things - S6-E6
Continuity mistake: Peter is at his sister's house, in the kitchen, and they are talking about Carla. Jackie takes the dish towel off her shoulder and drapes it over a chair back and heads for the fridge. When the shot changes to her standing at the fridge, the towel is over her shoulder again. In the next shot, it's gone again.
Masquerade - S5-E5
Continuity mistake: The patient Coco is sitting up in her bed talking to Mark about the drug he gave her. From one camera angle her hands are in front of her, but from another her hands are behind her.
Good Luck, Ruth Johnson - S5-E9
Continuity mistake: A policeman is in the ER talking about the little boy who was shot. He gives Carol a schoolbook with the boy's name in it. She looks at it and asks, "What about Wilson's family?" and then closes it - then as the cop answers, "Workin' on it", we see her closing it again.
Continuity mistake: Dr. Wesr is talking to Kerry outside while it is snowing. He has quite a lot of snow on his shoulders, but within a few seconds, most of it has disappeared, which in real life wouldn't happen.
Do You See What I See? - S4-E10
Continuity mistake: After Dr. West leaves Anspaugh's office, the next shot shows both Kerry's hand and stethoscope have changed position. Also, the throw which had been fully visible behind her, is now only visible on the right side.
Continuity mistake: When Carter first starts to confront the drunk patients Angel and Nathan, the door to their room is open behind him. Angel falls to the floor and the shot shows the door is now closed. The shot goes back to Angel laughing and the door is ajar again. Then it's closed again, and then open when Susan comes into the room. All this happens within a few seconds.
Continuity mistake: Mark asks the fireman if he can crash there for the night. His hat and the magazines on the table change position from shot to shot.
Answer: Take care of your dad.