This is crazy. Look at that title, "The Adventures of Luke Skywalker as taken from the 'Journal of the Whills' Saga I: Star Wars." I'm immediately intrigued... by everything. Who is this Luke Skywalker? What is the Journal of the Whills and why is it important? I'm glad it was eventually changed, but there's something cool about it. At the time they weren't so sure that there would be a sequel, let alone a million other sequels, so having such a lofty title wasn't a good idea.
Did you know that the first movie only includes the Death Star blowing up because they weren't sure there would be a sequel? Originally there is only one Death Star destroyed in George Lucas' story. They moved it to A New Hope so that it would have a dramatic finish.