Thank you Ryan I will leave one further thought. The place they detonate the atomics from in the script is called communication room.

Although for a communication room there is more scientific equipment and bottles and filters and things like more of a laboritory than anything else. This place would seem to be Dr Kynes Laboritory. That is what I think although I can not confirm such a thing but it may mean that Max Von Sydow may have had a scene here even if only when Thuffer Hawatt says “Kynes… Doctor Kynes”

Since we have no Palm Trees no sub tropical Conservatory in the palace and no plants in the sietch either that would seem to be the only last remaining shred of Teraforming plot that is shown although they are setting off Atomic bombs there.

I was thinking that might be that still image from the TV broadcast might be with the cave window in the cliff face. As Paul Gurney and Stilgar look out of a cave window over to the Palace. But I can’t be sure of this. It’s not obvious but it kind of links up. Not sure.