Ok. So, I compared the UMD release of this film to the Blu-Ray release and turns out that while both releases use the Rec.709 colorspace (or at least utilizing similar colorspaces), the Blu-Ray was more vibrant than the UMD.
I actually noticed it as well. I’m guessing that it was because it could be in reality a colour grading from the final digital master before they went back to the raw frames for the 2D remaster for the 2010 Blu-ray release. I already did a re-render of the whole video with the colour grading of the credits to match the ones on the Blu-ray, and it turns out great from my eyes. That would finally explain to me why I’m calling this upcoming update v2.0.