Visible crew/equipment: When Dr. DeRaad asks Kerry if she knows Paul Sobriki she tells him to check the board, and as Kerry walks past the door we can see the reflection of a crouched crew member walking backwards, pulling a rolling microphone stand. (00:02:45)
Visible crew/equipment: When Luka and Mark are questioning Amira about the knife Sobriki had used, Kerry walks in then tells Amira to go upstairs to get security to open the personnel office, and the green T-mark taped to the floor is visible near Luka's feet. (00:16:45)
Continuity mistake: While operating on Lucy, Kerry Weaver gets massive amounts of blood on her left sleeve, but when she is sent to the OR the sleeve barely has any blood on it.
Character mistake: This has happened a few times before on this show. At the beginning of the episode, they are having a very loud party in the ER. There is no possible way this could ever happen in a real hospital. Even during an extremely quiet period, which rarely happens at County General, it would be extremely rude and unprofessional for patients. There's no way Kerry would be OK with such activities.
Continuity mistake: This episode is an instant continuation of episode 13. At the beginning of the episode, Kerry is walking in and asks if Mark is still on. Carol says he left at 8 for a double date. However, in the last episode, Mark was already at a restaurant with Elizabeth and their parents when Abby pronounced a patient's T.O.D. As 19:19. (00:00:55)
Visible crew/equipment: When Chen and Malucci walk into Doc Magoo's, as the camera pans around to the others already there, the reflection of the moving boom pole and mic is visible on the wall/window. (00:30:20)
Revealing mistake: After Mark gives his father the keys and tells him to park the van, in a following shot when Elizabeth joins the gurney rush with Carter, as she's walking backwards there's a distinctive large bulge at the back of her waist from the mic transmitter. (00:10:55)
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.