Hey all I LOVE the ideas for implementing foreshadowing Palps into LJ! I have an idea the rides off of what DZ-330 suggested, “Add Rey seeing a flash of Palpatine to her mirror vision?”.

my idea: If its possible and you are willing to rotoscope, in the mirror scene where the two silhouettes are becoming one and ultimately are revealed to be REY, in the moment where the two figures become one you could change the silhouetted figure to be hooded or in a cloak, like Sidious.

Lore wise this would make sense with the scene since Rey is supposed to be in a well of the darkside and having the well kinda alude to the dark truth of her parentage but ultimately foreshadow her identity being apart from Palpatine.