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Another Palpatine hint could be adding one in towards the beginning of the movie when Rey is training with Luke, the “you went straight to the dark scene” a subtle quiet laugh could be added before Luke screams “Rey!”
I like the rule of threes for things like this tease concept. So if we’re adding a laugh in the flashback scene, and radio moment at the end, the sith whispers and/or hooded figure in the cave feels like a good third place. I think the “you went straight to the dark side” scene is already a tease without the addition of any Palpatine-specific references. And I would hesitate to use the laugh again, as it feels like that would be one too many times!
Anjohar, I think those are good suggestions, and we’ll see how it feels when I get through these other thoughts first. I see what you mean about the radio moment, which is why I may try to keep V2 around for those that want it. Personally, I like the way it feels, and I really think something more explicit at the end is so helpful to build momentum for IX.