Visible crew/equipment: Just before Number 6 and the woman break into her father's watch shop there is a shot of the shop's front door, as the camera moves in on the door you can see the face of the cameraman reflected in the door glass in the bottom right. (00:32:01)
Visible crew/equipment: At the end of the episode when Number 6 gives Number 2 the device and tells him to leave the island immediately you can see the shadow of the boom microphone on the stone wall behind them at the top right of the screen. (00:47:17)






Answer: It's even more obvious than you think, you know who number 1 is in the very first episode. When 2 replies to the question "who is #1?" Change the way he answers from you are number one (in the monotone or accented answer to, "You are, number 6. The comma gives you the answer. #6 is #1. It's the tone of the answer.