Corrected entry: After using her new chest gizmo on an ER patient, Kerry addresses Dr. Anspaugh as "Doug" (Doug is the George Clooney part). This could be considered a character mistake, but he responds and they continue their conversation - in real life he would have corrected her.
Corrected entry: Season 12, episode "The Human Shield". Zoe's father comes to the ER to question Neela on why she has given Zoe medication. He knows her name only from the tag on the bottle of pills. The tag does not specify where the doctor in question works, there is no way he could have known that she worked in the ER and not in any other department. Zoe sure didn't tell him.
Corrected entry: Season 13, Episode 19: "Family Business" - Tony counts out three bills and hands them to his father to go buy groceries. When Tony berates him later for blowing it all on booze and Coming Home stumbling drunk, he screams that it was $100. There is no combination of US currency where three bills can add up to $100.
Corrected entry: In one of the last scenes, Dr. Lewis is shown leaving the ER, and putting a tack in the bottom of each page of "The Letter." However, at the very end of the episode, "The Letter" is shown blowing in the breeze, without any tacks holding the bottom of the pages down.
Corrected entry: A woman is brought into the ER who they think has had a stroke. When Dr. Carter is showing the x-rays to Dr. Greene, he tells him the woman is 27 years old. Later in the episode, Dr. Greene rushes to talk to the surgeon and he tells him the woman is 25 years old.