Visible crew/equipment: After the cannibal woman spits on the guard as he walks through the prison transport ship, he comes to a long haired guy. But as he comes onto screen you can see the end of the set piece for the ship with the walls of the shooting studio visible. Then when the camera cuts to another angle it shows the guard still has a lot of ship to walk through. (00:09:25)
Visible crew/equipment: When Stanley is running down a hall to get back to the correctional facility to turn himself in, he encounters the Bug Bomb that came out of Thodin's nose. As he is swatting at the Bug Bomb, a prop pole in the top right corner of the screen as someone is holding it off camera moving the Bug Bomb around connected by string to this pole. (00:33:25)
Visible crew/equipment: While the Holo Prosecutor is reading off Thodin's charges, there is a close up of Thodin in his walker as he smirks at some of them. At the top left corner of the screen, the green screen stage is visible. (00:33:55)
Visible crew/equipment: When the computer frees Thodin from his walker and he starts to break free, on the right side of the screen that there is one of the film crew members crouched down on the ground behind him looking towards his direction. (00:41:40)
Visible crew/equipment: When Thodin cuts off Kai's arm and it falls to the ground, for a brief moment at the beginning of the shot of the floor as his arm falls to the ground the timer on the "daily footage" can be seen having made it onto the final print of the film. (00:59:55)
Answer: From what I'm seeing, the answer seems simple. The robotic heads allow the control of the body they need. However, no mater how advanced you make a robot's body, it will never quite be as flexible and versatile in it's movements and actions as a flesh and blood human body can be in most cases. And if they do put the effort into creating a robotic body with the capabilities they need, and be durable enough to last... it would cost a lot of money. The Cluster has a large influx of constant prisoners that they use for feeding the Lexx and other needs, so human bodies are easy to come by and in vast quantities. Them simply producing robotic heads with the ability to interface with the human nervous system and placing them on the decapitated bodies of expendable prisoners is a hell of a lot more cost effective and easier to do with the technology they have. It's just a cheaper, more effective option for them to have thousands fo 790 Units in production and use without the cost of manufacturing a fully functional and durable robotic body for them.
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