At the beginning of the movie, the title only says "TRON". Not until during the ending credits does the name "Legacy" get included in the title when it reappears.
The closing credits feature 3D computer circuits that pop-out of the screen.
The Walt Disney Pictures logo appears in the Grid digital world in Tron's design.
The "Tron Legacy" logo shown during the credits is not the final logo used in the promotional material.