Tarantino quotes, borrows from or pays homage to so many different films that the Academy could hardly list who he has “adapted.” That said, his screenplay is an original, not least with the Tarantinian dialogue. It draws inspiration from earlier works, but sets out anew.

Roger Ebert, on why Quentin Tarantino was nominated for Best Original Screenplay and not Best Adapted Screenplay for Inglourious Basterds. See also Esquire’s heartfelt profile on Ebert and Ebert’s “Nil By Mouth”.