Factual error: At the beginning of the show, Doug states that even though it's November, it's never too late to golf. A lot of this episode's scenes are outside as Lucy and Carter run around looking for a patient's father - the flowers are still blooming and the trees are full of green leaves, with only the slightest of autumn foliage, and few dead leaves on the ground. Considering the locale of Chicago, it looks like mid-September, certainly nothing like November.
Continuity mistake: When the med students throw the burning armchair over the balcony it tumbles down the steps, crosses the landing and continues to roll down the second set of steps to within a foot or so of Carter and Bernie. The next shot shows it on the landing again, and then tumbling down the last few steps again.
Continuity mistake: A policeman is in the ER talking about the little boy who was shot. He gives Carol a schoolbook with the boy's name in it. She looks at it and asks, "What about Wilson's family?" and then closes it - then as the cop answers, "Workin' on it", we see her closing it again.
Continuity mistake: When Peter and Elizabeth are in the locker room having a serious talk, Peter's tying his tie - but when the shot is from behind his shoulder, his tie is completely undone. When the shot is on Elizabeth, it's partly tied. This continues for a few shots.
Continuity mistake: Doug, Mark and Carol are in the lounge having pizza and Doug has just told them he's the new Pedes ER Attending. Carol asks Mark, "Aren't you thrilled?" Mark is holding a paper cup. A Split Second later, his cup's gone and his hands are apart in front of him. Doug says, "He's got his doubts," and now there's a cup in Mark's left hand.
Continuity mistake: At the beginning of the show, when Mark and Elizabeth are playing racquetball outside, an extra wearing a top with red sleeves walks behind Mark and disappears to the left. Just then, as Mark says "Romano, he keeps stalling", we see the same extra behind Mark again, heading to the left.
Continuity mistake: Mark is showing Lucy around the hospital and they go from an examination room to a trauma room - as they go through the doors, Mark is in front and pushes open the right door and we see it stays open. Lucy never touches it. But the shot showing them coming into the room has Mark letting go of the door and it swinging shut.