1. April 19, 1982. Truman Capote's only guest appearance on Late Night.
2. February 22, 2006. Philip Seymour Hoffman's only guest appearance on Late Show, promoting his Oscar nomination for "Capote," which he soon won as Best Actor.

Note that Paul and the band played James Brown's "I Got the Feelin'" at the end of Truman's second segment in 1982, and the nearly-identical "Cold Sweat" at the end of Philip's only segment in 2006.