Trailer
The trailer contained specially filmed footage in which Nick Charles (William Powell) is seen on the cover of the Dashiell Hammett novel The Thin Man. Nick Charles then steps out of the cover to talk to fellow detective Philo Vance (also played by Powell) about his latest case.
Charles mentions he hasn't seen Vance since The Kennel Murder Case, a film in which Powell played Vance. The Kennel Murder Case was released in October 1933, just seven months prior to the release of The Thin Man.
Charles goes on to explain to Vance that his latest case revolves around a "tall, thin man" (referring to Clyde Wynant), just before clips of the film are shown.
Read more about this topic: The Thin Man (film)