Betty Comden was hired to play Garbo at the end of the film because the producers were sure that the real Garbo either could not be located or would flatly turn them down. They did try however, a known associate of Greta Garbo's. He was located and was asked to ask the great actress if she would appear in the film, but the associate never responded back. That is Comden we see in the film.
The film's title is taken from the famous Tinseltown Old Hollywood expression "Garbo Talks" which recognized the significant time that silent film star Greta Garbo was first heard speaking in the talkie Anna Christie (1930) which was a filmed adaptation from the stage play by Eugene O'Neill. The picture was promoted with the slogan tagline GARBO TALKS!.
The film was able to garner a Golden Globe nomination for Best Performance by an Actress in a Motion Picture - Comedy/Musical for Anne Bancroft, the movie's only major nod, but Bancroft lost out to Kathleen Turner for Romancing the Stone (1984).