1. Wings (1927-28)
2. AThe Broadway Melody (1928-29)
3. Grand Hotel (1931-32; the only winner with only one nomination: BP)
4. Cavalcade (1932-33; an adaptation of a Noel Coward play)
5. Hamlet (1948; not surprising since William Shakespeare essentially wrote the script!)
6. Titanic (1997)
So it’s been since 1998 that a film without a screenplay nomination has won BP. Does this rule out Mad Max: Fury Road and The Revenant? They are the only two BP nominees without screenplay nominations this year among the eight BP nominees. I do think it gives an edge to The Big Short and Spotlight, the likely winners in each of the screenplay categories (although Room could surprise for Adapted Screenplay)… statistics would def. favor TBS and S.
You’re missing the Sound of Music.
Since the WGA was formed no film has won after missing both the WGA and the Oscar screenplay. Titanic was nominated for WGA and The Sound of Music won Best American Musical at WGA.