5:47 - Yoda: "Always in motion is the future." He also says this in The Empire Strikes Back [1:17:54].
14:56: One of the citizens of Alderaan (far left) in the applauding crowd has clothing and a hair style that are apparently meant to be reminiscent of Leia's in A New Hope.
16:55 - Padmé: "And if you strike my voice down, know that a chorus of thousands shall rise up in its place." The first part of this resembles what Obi-Wan says to Vader in A New Hope: "If you strike me down, I shall become more powerful than you can possibly imagine" [1:30:48].
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At 2:37, there's a very brief musical cue of Yoda's theme, and at 8:35, Leia's theme is heard, which Dave Filoni mentions in the episode featurette on the Star Wars website.