Ruth Roman, who plays Liz Imbrie, and Diana Lynn, who plays Tracy Lord, were both married to 'Mortimer Hall'. Ruth, married from '50-'55, had a son, "Dickie" Hall with Mortimer. Diana was married to him from '56 to her death in '71 and had 4 children with him. When this film was made, within the previous 5 years the 2 female leads had been married to the same man.
The original Broadway production of "The Philadelphia Story" by Philip Barry Jr. opened at the Shubert Theater on March 28, 1939, ran for 417 performances, closed on March 30, 1940 and starred Katharine Hepburn.