I do have a vague memory of the Billie Jean King / Bobby Riggs tennis match. And all those cracks about women’s libbers and male chauvinist pigs were pretty common in the 70’s.
The movie was well done, and engaging, with many famous faces in the cast: the leads as well as many of the supporing roles.
The tennis seemed a bit slow, compared to recent pro tennis, but then I read about Riggs’ style: drop shots and lobs. And they did use “tennis” body doubles in the movie.