Visible crew/equipment: As Spock swings the scanner around, as it points toward the camera position, the camera equipment is reflected on the chrome plate on the front.
Visible crew/equipment: When Spock walks into the briefing room, he stands in front of the closed doors telling himself that he's in control of his emotions, and when he says, "My duty," the shadow of the boom mic can be seen moving across the wall at the top of the screen. (00:36:40)
Answer: Kirk was getting his physical and Dr. McCoy probably turned off communications, because if he hadn't, Kirk would have left and headed straight for the bridge, leaving McCoy irritated.