You cannot remove dialog if it's mixed in the same channel with the music and sound effects. I'm assuming Clone Wars has a separate channel for dialog hence the easy extraction.
The same thing goes for music. You can use a phase inversion technique to remove everything but the center channel, which is usually the vocals, but traces still remain of the music in most instances.
You can't just magically extract something after its been mixed. It's like trying to remove the egg from a baked cake. :)