Continuity mistake: When Anna is holding the "virtual pet" after realising it has died, in the shots from the front she is holding it in both hands, but from the back it's only in her right hand. It's tricky to see because there is a pile of papers in the way, but her left hand is folded in front of her in the shots from behind.
Continuity mistake: In season 2, Doug mentioned that he hadn't seen or spoken to his father in 22 years, since he was twelve. But when he's going through his father's things at the motel, he finds pictures of himself from high school. Plus, he mentions his father teaching him how to drive when he was about 13 or 14.
Suggested correction: He said he was 13 or 12 no mention of 14.
Continuity mistake: When Carter is examining the patient Tom Angevine who drove into a tree, we can see two very noticeable parallel cuts from his eye to his chin - but as it goes to close up they miraculously disappear.
Continuity mistake: Lizzie puts two cans of soft drink on the table in front of Peter - but a short time later they have moved noticeably, even though neither of them touched them.
Continuity mistake: The patient Zoe is in the ER with her boyfriend while Doug, Carol and Lydia work around her. At one point she puts her hand up to her throat, but in the next shot it's down by her hip, without enough time for the change.
Freak Show - S4-E8
Continuity mistake: Peter, Elizabeth, and Romano are with the little boy who has organ reversal and as Romano says "genetic breakthroughs are in the wings", Peter puts on one glove. As Lizzie asks him if something is wrong, he is putting on the glove again. As they continue to talk, he begins to examine Rodney, but when the shot changes, he is still putting on his gloves.
Of Past Regret and Future Fear - S4-E20
Continuity mistake: After Anna tells Tina Marie she might have kidney problems, Tina grabs her husband Emmett's hand and then puts her other hand over it; the next shot shows her hand is still on the tray and then she moves it to cover Emmett's again.
Continuity mistake: When Carter comes into the ER with breakfast for everyone, he slips on the muddy floor and the food goes flying. A cardboard tray flies straight up from his left hand but ends up a few feet to his right, which defies the laws of physics.
Ground Zero - S4-E6
Continuity mistake: Carter is talking to Carol about his grandmother. The shot is mainly on her but we can see him put his pen away and pick up a chart - then the shot goes to him and we see him do the same thing again.
Visible crew/equipment: When the ER team is helping Victor's children and wife you can see a camera's reflection on Lydia's back when she is helping Victor's daughter.
Continuity mistake: When Kerry is talking to Doug about his fellowship proposal, his stethoscope moves a couple of inches higher on his neck, even though he never touches it.
Obstruction of Justice - S4-E9
Continuity mistake: Near the start of the show, Carter gets a can of soft drink from the machine and just then his cousin Chase shows up in the ER - they hug and somehow the can, which should be in Carter's hand, has disappeared.
Continuity mistake: When Jeanie and Al are in the diner, when she spears a piece of fruit on her fork, Al has his hand on his hip. However, when the shot changes and she says, "How about your grandmother?", his hand is up on her shoulder.
Continuity mistake: Dr. Wesr is talking to Kerry outside while it is snowing. He has quite a lot of snow on his shoulders, but within a few seconds, most of it has disappeared, which in real life wouldn't happen.
Do You See What I See? - S4-E10
Continuity mistake: After Dr. West leaves Anspaugh's office, the next shot shows both Kerry's hand and stethoscope have changed position. Also, the throw which had been fully visible behind her, is now only visible on the right side.
Obstruction of Justice - S4-E9
Continuity mistake: When Carol goes to get Doug to see the sickle-cell patient, the clock reads 3:50. The next few scenes include Rachel arriving at the hospital and being taken to the dentist and for a dual makeovers by Cynthia. When Mark is walking by the same clock with Herb the lawyer, it reads 2:30. He then says goodbye to Herb and his ex-wife arrives to pick up Rachel, who is now back in the ER with Cynthia. The clock times do not reflect the sequence of scenes.
Continuity mistake: Romano is standing outside an ER room watching through the glass. To his left, down the hall, we can see a woman pushing someone in a wheelchair. But when the shot goes to him entering the room, there's an extra behind him on the left pushing a large cart of supplies - there was nowhere for him to come from.
Continuity mistake: Doug goes into the ER room to respond to the boy, who's saying "go away." His mother has her arm around his head and is telling the drunk with his teeth out to go away. Then the shot changes and we see the boy's head, but no mother. A quick shot change and there she is again, cradling his head.
Continuity mistake: Mark comes into the cafeteria with a sytrofoam bowl of something, and when he sits down he starts to take the lid off. The next shot shows him already eating it with a spoon - there was no time to accomplish this so quickly.
Freak Show - S4-E8
Continuity mistake: When Peter comes in to talk to Rodney's father Isaac, the clock on the wall says 11:40 - which it had also read a few scenes earlier when Rodney came out of surgery. After Peter checks the chart and starts to talk to Isaac, the clock has somehow changed to 3:30.
