Vanessa Redgrave trained for six months in order to imitate Isadora Duncan's dancing style in the film.
Last film of Robert Ayres.
When filming "the Russian dance sequence" in a theater filled with unsuspecting extras, Vanessa Redgrave duplicated a real-life incident in the life of Isadora Duncan by ripping off the top of her dress and dancing bare-breasted. The extras were not told that she would do this, thus providing the desired audience-aghast reaction shots that director Karel Reisz wanted.