Visible crew/equipment: After McCoy examines Charlie and they talk about how Charlie learned to talk by just listening to the ship's tapes, when Charlie stands up the two actors' marks can be seen on the floor - the short one for Charlie and the longer one for McCoy, where they both will stand momentarily. (00:04:56)
Visible crew/equipment: When Charlie catches up with Rand and gives her the present, the microphone can be seen moving around at the bottom of the screen in the shots with both of them. (00:06:48)
Visible crew/equipment: After Uhura tells Kirk that "Captain Ramart of the Antares is on D channel," Kirk and Charlie head to the bridge, and when it cuts to Uhura the actor's tape mark can be seen on the floor behind her, where Charlie will stand when he steps out of the turbolift.
Answer: After causing Norman to overload, all of the other androids shut down. The same could be said for the androids on the Enterprise.