I watched a bit more..
When we cut to ANH the regular score almost doesn't fit now, due to the almost sombre mood before. :)
Also, I see it is almost 4 hours long, I thought it was about 2... So that explains some of the artifacts.
Edit: Well, you all know how changing the music in a movie changes the mood, but it's really funny how different it is now because the SW score is so well known and ingrained in you. :)