The Clone Wars - S2E12 - "The Mandalore Plot"

12:08 - Obi-Wan:  "I am here on a diplomatic mission."  The phrase "diplomatic mission" occurs a couple times in A New Hope.  Captain Antilles tells Vader that "We're on a diplomatic mission" [5:55], and later Leia tells him, "I'm a member of the Imperial Senate on a diplomatic mission to Alderaan" [7:58].

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].

---

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.