I've only noticed one little change on the 6th DVD in episode 24, and not only is it impossible to call an improvement, it's impossible to understand why it was changed - Konoka is reading a letter and, in the TV version her eyes scan the page but in the DVD version they do not move. The sharp eyed may notice that I've used the same DVD screenshot three times.. this is not an error, I just couldn't see the point in making three identical screenshots.
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The only reason for the change that I can think of is a desire to convey some degree of shock. But given that I can't remember the episode, I'm not too sure how correct that would be.