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TIL there was a face briefly visible on a scene of RotS
(files.catbox.moe)
Alternative image
Supposedly, this is the same person as here
Edit:
Thank you @ech@lemm.ee for the gif!
Also found a source on Youtube: https://www.youtube.com/watch?v=7DBK1kuaXds
It's more likely that the person shown on set is a vfx person making sure everything's being filmed right for their part, and he superimposed himself during the vfx editing on purpose.