According to the date visible on the newspaper, the principal action of this movie, following Hyde's assault on the little girl, takes place in August 1884.
Lionel Jeffries played Sir Michael Caine's father. In real life, Jeffries was only seven years older than Caine.
The setting for this retelling of Robert Louis Stevenson's 'Jekyll and Hyde' novel is London in 1889. Near the beginning of the film, Sarah Crawford is seen dancing with her father, Dr Charles Lanyon. The melody to which they are dancing is Aram Khachaturyan's waltz 'Masquerade', which dates from 1941.