Per Paramount, "the main objective of the restoration effort was to remain faithful to the distinctive look created by the director and cinematographer... The restoration team secured a vintage print made at the time of release from the Library of Congress to view and study the tones and extensively researched documentation from the production to accurately present the director’s original vision. Although none of the original nitrate materials survive, the restoration team conducted a worldwide search for the earliest generation elements, ultimately using an acetate 35mm duplicate negative as a primary source for scanning at 4K to create the highest picture quality possible."
Below watch two classic scenes from the film that showcase the restoration work, along with a clip from one of the special features included on the disc.
Film Clip: "I am big...it's the picture that got small."
Film Clip: "I'm ready for my close-up."
Special Feature Clip: Discussion of the mansion and pool featured in the film.