A casual scan found that it includes Lulu's calling Wakka and the rest of them "Kids!" and her "no matter how dark the night" quotes, which I've not found in any other script online.
FFX Complete Game Script by Shotgunnova.
Still not complete. It is missing some sidequests like Baaj temple and Omega ruins. For even more, check out this multi-page FFX script. See especially the Jecht spheres page and the Maechen Speeches page under "Extras".