Let's see here...besides the obvious ones like "Fear is the path to the darkside..." we have:
"Sometimes we must let go of our pride and do what is requested of us." - Vader sacrifices himself and his dreams of taking over with his son, in order to save his son, who oddly requests him to save him.
Anakin blowing up the Death Star-shaped Trade Federation ship/Luke blowing up the Death Star
Follow me on this one. Palpatine in the third film is using Force Lightning on an ally of Anakin when he switches to the dark side, and Mace is thrown to a death. Now in the third film of the OT, Palpatine is using Force Lightning on an ally of Anakin, his son, when he switches to the light side, and throws Palpatine down to his death.
Anakin in Episode 2 grasps the sphere in his hands - Anakin is given control of the Death Star in a way
Owen seems to think that Anakin shouldn't go searching for his mother, and should, yes, "stay on the farm", and you know what the deal is with Luke in ANH.
Padme is wearing an all white outfit when she first says she loves Anakin, meanwhile Leia is wearing an all white outfit when she first says she loves Han
Anakin's mistake in Episode 2 is going through the power coupling, where he gets partially electrocuted - later on, he dies from electrocution.
Anakin, before his transformation, never wields his own red bladed lightsaber, symbolizing that there is still good in him, even in the Mustafar duel.
I'll think of more another time when it isn't 3 in the morning lol