Visible crew/equipment: In the elevator shaft/rocket boot sequence, the 'arm' of the lift device that is actually holding Spock casts a strong shadow on the wall to our right of Spock, indicating the arm goes from Spock's back to the black vertical slot in the right wall. It is most visible as Spock first lowers into view next to Kirk. (01:02:40)
Visible crew/equipment: When Kirk falls at the beginning of the movie and Spock catches him, you can very easily see the tether cord affixed to Kirk's back.
Visible crew/equipment: During the fight sequence between Kirk and Spock's brother Sybok you can see crew's hands helping lift Kirk up when he is being thrown. (Far right of screen).
Visible crew/equipment: When the being they think is "god" shoots Kirk with lighting eyes, you can see the pull wire on his back as he flies back.