During the time-period of this movie, the Newport Casino did not have a tennis court located where it is shown in the movie. It was merely an open lawn.
The Cole Porter song "You Do Something to Me" was prominently featured at the end of the film, including being played and sung by the band at the ball. The film was set in 1926, but Cole Porter did not publish this song until 1929.
In the courtroom scene, the water pitcher on the judge's bench is a commercial foodservice type made of polycarbonate plastic, a material only first made in 1953.
The rackets used during the scene set at the Newport Casino / International Tennis Hall of Fame are obviously from a more modern era, as well as having broken strings and generally being in poor condition.