2:12 - Count Dooku holds two lightsabers to Savage in the same way that Anakin does to Dooku in Revenge of the Sith [14:08], although none of the shots really match:
3:52 - Dooku (to Savage): "Concentrate." Yoda also says this (to Luke) in The Empire Strikes Back [1:08:40 and 1:16:38].
4:03 - Savage (to Dooku): "What you ask is impossible." Luke says something similar to Yoda in The Empire Strikes Back: "You want the impossible" [1:11:21]. Moff Jerjerrod, speaking to Vader and referring to the Emperor, has the same complaint in Return of the Jedi: "But he asks the impossible" [4:21].
4:37 - Savage (to Dooku): "I hate you!" Vader says this to Obi-Wan near the end of Revenge of the Sith [2:00:15].
6:50 - Anakin salutes Brother Viscus after he releases him. Perhaps coincidentally, in Return of the Jedi, Luke gives a similar salute before feigning a jump into the Sarlacc pit [32:32], and Han and Lando salute each other after Han lends the Millennium Falcon to Lando [52:20].
17:22 - Obi-Wan (to Anakin, about Savage): "We'll take him together." He also says this (also to Anakin) in Attack of the Clones, referring there to Count Dooku [2:04:54].