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.
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.
Continuity mistake: When Mark and Elizabeth are coming round the corner to enter the hospital, Mark says, "Remind me again why you invited her to stay with you", and he has one arm around her and in the other hand he's holding a newspaper. As the shot changes when they go round the corner, his arm is no longer around her and both hands are on the newspaper. There was no time for the switch.