It was such a important thing for Obi-Wan to say to Vader in ANH "If you strike me down, I shall become more powerful than you could possibly imagine", that if Lucas left that out in 3, then yes major plot hole.
But as it stands, at the moment I can't seem to find any.
Like I said somewhere before, wait till 3, then go on about plot holes.
As for Padme and the hanger, DJR seems to have summed that up nicely
