Yeah I noticed that too. It was while Obi-Wan and Yoda were at the temple that Palpatine was announcing the creation of the Empire, so there's no way Obi-Wan could have known or been told.Originally posted by: kAi
Another part I didn't like was the fact that Obi Wan called Palpatine an 'Emporer' when he was at the Jedi Temple with Yoda, when he wasn't there for the Senate meeting. As up to that point he has always been 'Chancellor' to him, and suddenly he knows him as an 'Emporer'.
And Knives122, I heard it was Lucas' nephew, not his son.