0:18 - Narrator: "Sent to investigate allegations that Mandalore was joining Count Dooku's Separatists, Obi-Wan was reunited with an old friend, the Duchess Satine of Kalevala." Perhaps coincidentally, the phrase "old friend" is also used in Attack of the Clones (where Palpatine suggests "an old friend, like Master Kenobi" to protect Padmé [6:34] and Count Dooku calls Mace Windu "my old Jedi friend" [1:50:24] and just "old friend" [1:56:05]), in Revenge of the Sith (where Obi-Wan says, "Goodbye, old friend" to Anakin as he leaves for Utapau [51:13] and Yoda refers to Qui-Gon as "an old friend" [2:09:56]), in A New Hope (where Leia sarcastically says, "We, uh, ran into some old friends" when Han asks her and Luke where they've been [1:31:33]), in The Empire Strikes Back (where Yoda says that through the Force, Luke will see "Old friends long gone" [1:17:05]), and in Return of the Jedi (where Luke says, "I have a promise to keep to an old friend" [37:37] and Han calls C-3PO "an old friend of mine" [1:11:53]).
In the "Creating Mandalore" featurette on the DVD, Dave Filoni says that the design of Mandalore has a "Nordic flavor." The name of Satine's home world is also one of these Nordic-inspired elements; Kalevala is the title of a Finnish epic poem.
10:34 - Anakin (to the clone troopers as assassin droids attack): "Get behind me." In A New Hope, Han Solo says this twice to Chewbacca as stormtroopers attack [1:17:12].
12:28 - Obi-Wan: "I sense it too." Here, he's referring to the fact that one of the senators is a traitor, but he also says this in Attack of the Clones when he and Anakin perceive intruders in Padmé's room [14:08].
19:47 - There's a brief cue of the Imperial march as Anakin kills Tal Merrick*.
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*There's some discrepancy in how Merrick's name is spelt. In the credits, it's Merrick, but on the Star Wars website, it's Merrik.