Continuity mistake: As Mark futilely pounds on Jodi O'Brien's chest, Carol can be seen in the background, removing her protective glasses with one hand. However, after the time of death has been called and they're showing the reactions of everyone present in the room (Susan, Carol, Carter, Lydia, Chen), Carol is seen taking the glasses off again, this time with both hands.
Factual error: The kid from the car accident has had an orthopedic device called a halo put onto his head in order to immobilize his head and injured spine. This item is screwed directly into the skull and is very secure. However, when the doctors are giving the boy CPR, the halo stays stationary but the child's head moves back and forth inside of it. The halo should have kept his head still, or his head would have moved only if the halo moved.
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.
Continuity mistake: When Morris is on the bed following his shock there are three point of view (POV) shots. Morris on the bed, Morris's POV of the medical staff hovering over him and a shot from behind the staff looking down on Morris. The placement of characters is misaligned between views, most notably when the shot is from behind the staff looking down: there is a sizable gap between the two on the left and right, where as from Morris's POV they are clustered close together with no gaps between the staff members.
Continuity mistake: Peter goes into the operating room, demanding to help with his mother's surgery. When he goes in, his cap is pulled down over his hair, but when he is talking to the surgeon in charge, about an inch of his hair shows for a couple of shots. The surgeon orders him out, and he leaves, and his hair is completely covered again. At no time did he adjust the cap.
Continuity mistake: Luka is in talking to the first possible kidney transplant patient - he puts his pen into his pocket and is holding the chart in his other hand, also up by his chest. As he says "Minneapolis", the shot changes and we see him put his pen in his pocket again and his chart is down by his waist - there was no time for the shift.
Continuity mistake: Doug and Peter are running to meet the ambulance transporting the boy with the crushed leg. From the back we see Doug with his arms out as he runs, but the shot changes to the front and he has his hands in his pockets, with no time to change naturally.
Visible crew/equipment: When the son of the accident victims is being led through the trauma rooms to see his parents' bodies, you can see Laura Innes crouching under a table in the background directing the scene. Innes was the director of this episode and it was established that this episode took place on her character's day off. Therefore, she should not have appeared in front of the camera at all.
Plot hole: When Mark slips and falls in the staff lounge, he puts both hands on the table to catch himself - but we can see him (the actor) quite deliberately lower his head to one hand - this is supposedly where he cuts himself, but he actually hits his hand and not the table. This would not produce the deep cut he ended up with. Also, the head makes contact on the left of his forehead and he ends up with a cut on the right. And when we actually see the cut, it is vertical and logic tells us that it would have been impossible for him to have a vertical cut from the angle he fell.