Continuity mistake: When Louise is talking about her mother's Parkinson's, the camera shot from behind her shows her left arm folded up in front of her with something red over it - but the shot from the other side shows the red item draped over her right arm.
Continuity mistake: Dr. Romano hands Lucy a pen so that Valerie's mother can sign a consent form. Lucy puts her hand on the pen and then the shot changes and we see her put it on the pen again.
Visible crew/equipment: When the pedestrian Michael hit goes into the trauma room, when the ER doctor closes the door for a brief second the camera is visible.
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.