The re-created Maysles footage has the clean, sharp look of digital photography. Grain and softening should have been added to make it look more like the caught-on-the-fly celluloid that was the brothers' signature.
As Slim Keith is preparing for the ball, she becomes furious that Truman Capote has he invited "Pamela Harriman," who stole and is now married to Slim's ex-husband Leland. "Leland" was producer Leland Hayward, and so Pamela would have been "Pamela Hayward" in 1966.
Furthermore, Truman says he invited Pamela for "political" reasons, but Pamela did not marry former New York governor and US ambassador W. Averell Harriman until 1971.