2:15 - Mother Talzin (to Ventress): "And then you will fulfill your destiny and become a true Night Sister." Emperor Palpatine uses the same expression in Return of the Jedi when he tells Luke, "Now fulfill your destiny, and take your father's place at my side" [1:53:38].
2:54 - Count Dooku (to Grievous): "Go there, and wipe the witches out, all of them." Darth Sidious uses the same phrase in The Phantom Menace (talking to Nute Gunray and referring to the Gungans): "Wipe them out, all of them" [1:44:52].
5:22 - General Grievous (to a battle droid): "Begin landing our troops." Darth Sidious says almost the same thing to Nute Gunray in The Phantom Menace: "Begin landing your troops" [4:46].
16:05 - Mother Talzin: "Pain, Count Dooku. You will know terrible pain." This is similar to what Yoda says to Mace Windu in Attack of the Clones: "Young Skywalker is in pain, terrible pain" [1:21:27].