Visible crew/equipment: In Episode 8, "Cabin in the Woods": When Daedalus finds Archon on the floor of the mansion, he picks him up and helps him into a chair. The camera follows their movement upwards when they are rising from the floor, and there is a boom mic that comes into view, at the top of the screen.
Episode #1.6 - S1-E6
Visible crew/equipment: When the Demon Headmaster is travelling by helicopter to 10 Downing Street at one point there is a close-up shot of his face and you can see a square light screen reflected in his glasses. There's no excuse for this since he's supposed to be high in the air. (00:21:23)