Visible crew/equipment: When Number 2 and Number 6 are talking at the beach there is a shot of Nadia getting into the sea. Just before she takes her sunglasses off you can see rows of spotlights reflected in them. This is because the scene was shot in a studio and not a real beach. (00:15:25)
Visible crew/equipment: When the unconscious body of Nadia is being dragged onto the beach by Rover you can see the distinct shadows of two crew members and the camera being cast on the ground. (00:18:06)
Visible crew/equipment: When Number 6 meets Number 2 at the hospital, the shadow of the boom microphone is visible moving around at the top of the screen (on the wall), just before Number 2 greets him. (00:18:53)
Chosen answer: We're led to believe Rover is some kind of robot in the series. According to books on the show, Patrick McGoohan was looking for an unusual guardian for the Village, looked up at the sky, and saw a weather balloon, which was what Rover was.
Captain Defenestrator