Along with Jack Teagarden (trombone) in the nightclub sequence, the band's Jimmy Giuffre (saxophone) on the far left and Shelly Manne (drums) can be seen. Shorty Rogers (trumpet) is leading the band. He and Bob Keene (clarinet) supply off camera solos for the actors.
According to a contemporary article in the New York Times, this was the first film to use the newly-constructed United Nations building in New York City as a location. Construction was officially completed four months after production ended on this film.
In the beginning of the trailer, Shelley Winters is shown and her name is displayed to introduce audiences to her then-husband, Vittorio Gassman in his American debut. Winters isn't otherwise involved in the movie.
Mrs. Hinckley, the landlady, is holding a copy of the June 1947 edition of Screen Romances magazine with Ingrid Bergman on the cover.
The distance Peter has to walk from the vicinity of Times Square to the United Nations building is about 1.2 miles.