TRON: Legacy appears as a level in Kingdom Hearts 3D, called The Grid; while it's mostly unrelated to Space Paranoids from Kingdom Hearts II, there is a minor connection between the two worlds when playing as Sora. Rinzler also serves as a boss in the game.
Executive Meddling: Daft Punk's score was heavily altered by Hans Zimmer and his company Remote Control Productions after test audiences had trouble following the music. As a result, it sounds less like Daft Punk and more like a ripoff of Zimmer's own Inception and Brad Fiedel's Terminator.
Promoted Fanboy: Michael Sheen was so eager to join Legacy, being a huge fan of the original, that his agents actually had to hide his fandom from Disney so the actor wouldn't get lowballed for it. Similarly, Daft Punk; Word of God states that his initial interview with the duo felt more like the musicians were interviewing him to make sure he was doing right by the Tron name.
Recycled Script: A surprising amount of plot elements from TRON 2.0, the discredited sequel, match the movie. Son of the original leads? Check. Running through cyberspace looking for his dad? Check. Drafted to the lightcycle arena deathmatch and rescued by a mysterious female Program? Check. Flynn gone missing in both timelines and no one knows where Tron himself vanished to? Check...