Inspired by this question: Why did Obi Wan tell Luke his father wanted him to have his lightsaber?
I wondered why they didn't retcon the dialog between Vader and Obi Wan in A New Hope:
VADER (TO OBI-WAN):
When I left you, I was but the learner; now I am the master.
In mind of the prequels I think "When I left you" is a bit awkward. "When you left me" would be a bit more natural, I think. Perhaps even "When you left me burnt and in agony to die a terrible death" would be more what I would expect.
In ESB they retcon the whole dialog between Vader and the emperor (in the German dub with a completely different voice). Why didn't they "correct" this dialog, too?
Yes I know. It could be true from a certain point of view.