Carrie Fisher toasting
Anthony Daniels, who voiced C3P0 and climbed into the tin suit, is the only actor to appear in all 8 Star Wars. Kenny Baker did not actually film anything for Revenge of the Sith, his parts were footage recycled from Attack of the Clones.
How this scene was filmed
Bail Organa and Yoda step into the hallway of Organa’s ship and have a nice chat about being rebels or something in Sith. It’s also the actual ship that Darth Vader boards to capture Princess Leia Organa in the start of A New Hope.