In another one that doubles as a Tear Jerkerand a Call Forward, Obi-Wan reflecting that he always expected that, when he died, Anakin would be with him.
Near the start of the film Anakin verbally defends R2-D2 when he thinks Obi-Wan may be (unintentionally) insulting the droid, telling his former Master, "No crossed-wire jokes," and declaring that R2-D2 is "Doing his best." It's really heartwarming, especially since we didn't get to see that much of this part of Anakin's personality until the Clone Wars cartoon came out.
A subtle one, but after Obi-Wan's duel with Anakin on Mustafar, he returns to Padme's ship, and Threepio is out there waiting for him. When Threepio suggest they should leave, Obi-Wan just gives him a weary pat on the shoulder. It's a small but very touching moment.