I started rereading all my SW books that I really like (minus New Jedi Order, Legacy of the Force, Fate of the Jedi series) since around last July. Anyway a couple points. I remember a discussion on here months ago where people thought that the term "Dark Lord of the Sith" wasn't used until the Prequels because it never appeared in the OT. In Splinter of the Mind's Eye they use that term and it was out in 1978.
The other thing that always bugged me in the old EU is in most cases, up until the Yuuzhan Vong war, the New Republic (well the authors really) would send out completely inadequate fleets to counter problems. They would have an Imperial force of multiple Star Destroyers and support ships, and the New Republic would say "We need to stop them! But all we can send you is an Assault Frigate, an Escort Frigate, and a Fleet Carrier. Good luck!" They did the same thing the Sequel crew did to try to make this govt. with many fleets, reduced back to the Rebel Alliance for story purposes. Just once I would have liked to have had them fly the Lusankya (post X-Wing novels) and win without Luke and co doing something to turn the tide for the weaker fleet.