Continuity mistake: Harper is talking to Mark about her night with Doug and her stethoscope is hidden in her collar and lapel on her right. As the shot changes and she turns, it is suddenly fully visible and the left side has moved much further up towards her neck.
Do One, Teach One, Kill One - S2-E3
Continuity mistake: As Chloe moves backward away from the fence while talking to Susan, we can see her friend Ruth in the convertible, sitting up on the back of the seat. In one shot Ruth completely disappears but reappears again, all in the course of a few seconds.
It's Not Easy Being Greene - S2-E13
Continuity mistake: Carter goes into the faculty dining room to talk to Peter and Dr. Vuselich - he has a brown strap around his neck (with his stethoscope) which changes position several times during the scene, even though he never touches it.
Baby Shower - S2-E15
Factual error: The majority of the babies that come out are far far too clean. This is particularly noticeable with the 2 twins, where the second one has nothing cleaned off it when it's presented to his mother.
Continuity mistake: Susan is at home, making drinks for Mark and her - she pours them drinks from the blender and leaves a little bit of liquid in the blender. They head for the living room and the blender suddenly has about 3 inches of liquid in it.
It's Not Easy Being Greene - S2-E13
Continuity mistake: Harper and Carter are in bed and his hand is bunched under the bedspread several inches from her hand. The next shot shows his hand is up by hers, touching her bottle of water, with no time for natural movement.
Baby Shower - S2-E15
Continuity mistake: At the beginning of the show, Peter is scraping the ice off his windshield, but the scraped pattern we see from inside the car is different from the pattern outside. When the car won't start, he gets out, and more of the windshield has been scraped in the meantime.
Continuity mistake: While Doug is giving CPR to the kid that was stuck it is pouring rain and everyone is soaking wet. When he runs with the kid and cop to the ambulance, it is no longer raining and they are all dry.
Continuity mistake: Jerry is eating a hot dog while he talks to Carter. He is holding it with one hand. The shot changes and suddenly he has two hands on it but then the next shot goes back to the first position.
Continuity mistake: Peter is standing next to the bed of a the little girl who was hit by a car, talking to her parents. Suddenly there is a paper in his hand which hadn't been there in the shots before.
Character mistake: In the scene where a patient is about to give birth, Peter asks Jeanie to help him move the patient's legs but calls her by Haleh's name.
Answer: A man named Paul Sobriki comes into the ER in the season 6 episode 13 " All in the Family." He is complaining of headaches, Carter and Lucy decide to rule out meningitis and do a lumber puncture. Paul struggles during the procedure and believes that both doctors are stabbing him. Lucy, who is interested in Psych thinks something is wrong with their patient mentally, but Carter is dismissive of her. She gets cross with his attitude and she calls the psych department anyway to have a look at him. Later on and near the closing 20 minutes or so of the episode, all the staff start playing loud music and get a cake which appears to be blue lol, together to party as it's Valentines Day, Carter returns from somewhere and asks where Lucy is. He goes to check one of the rooms for her and Paul Sobriki comes up behind him in the dark and stabs him twice in the lower back, he collapses and as he falls unconscious he sees Lucy on the ground also. In the next episode, Be Still My Heart (ep 14), Dr Weaver discovers them and all of the staff work to try and save them, whilst Carter survives. Lucy's wounds are fatal and suffers a pulmonary embolism as Corday and Romano try to save her. Carter is grief stricken and feels guilty about the way he treated her, he becomes addicted to painkillers and Benton, Greene all help him and book him into rehab.