Revealing mistake: Near the beginning of the show, Mark's father puts a bulb into an old slide projector. Then there is a small explosion with smoke and flames - watched carefully, we can see are actually coming from the other side of the projector - the flames can be seen shooting parallel and close to the floor, which wouldn't have happened if the explosion actually came from the projector.

ER (1994)
1 revealing mistake in Under Control
Starring: George Clooney, Anthony Edwards, Noah Wyle, Alex Kingston, Parminder Nagra
Genres: Drama

Visible crew/equipment: When the son of the accident victims is being led through the trauma rooms to see his parents' bodies, you can see Laura Innes crouching under a table in the background directing the scene. Innes was the director of this episode and it was established that this episode took place on her character's day off. Therefore, she should not have appeared in front of the camera at all. (00:32:30)
Trivia: It is finally revealed here that Dr. Weaver uses the crutch because of congenital hip dysplasia.
Question: Does anybody know what the episode was called where that helicopter severed Romano's arm? I'm pretty sure it was season 8.
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Answer: It was in "Chaos Theory", the first episode of season 9 (time code 00:13:55).
Super Grover ★