I believe I know what spoilers you want.
Spoiler:
One new planet in Episode 3 is Kashyyyk (The Wookiee homeworld) And the clone troopers turn on their Jedi generals at this point in the film.There is a lava planet.
Mace Windu will have a talk with Palpatine when everything goes down.
Padme does die in the film.
I think they mean more about the ridiculous continuity problems caused by them being created by Anakin and 3-P0 having spent years at the Lars homestead, CLEARLY something GL never intended when we wrote ANH and something people are alrwady having to bother to make excuses about to cover up- likewise this if it is so.