20:33 - Pre Vizsla: "We'll catch up with the duchess soon enough." Perhaps coincidentally, Tarkin has a similar line in A New Hope when he tells Leia: "We will deal with your Rebel friends soon enough" [58:45].
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As Dave Filoni explains in the featurette for this episode on the Star Wars website, the painting in Pre Vizsla's meeting room (first seen at 10:55) is in the style of Picasso's Guernica.