The script drops hints that Heathcliff is really Earnshaw's illegitimate son, either by a mistress or a prostitute, and thus is Cathy's half-brother. While many critics over the years have debated an incestuous subtext in the novel, this was the first film version to be (relatively) open about the issue.
Judy Cornwell , seen here as the sympathetic housekeeper Nellie, would be featured in a screen version of another Brontë sister's work, playing the villainous Mrs. Reed in Jane Eyre (1983), which starred Timothy Dalton as Rochester.
AIP had announced a sequel, "Return to Wuthering Heights", but it was not made. Neither were other adaptations of classic novels mooted by the studio, including "Camille", "The House of Seven Gables", and "A Tale of Two Cities."
Timothy Dalton appears here as Heathcliff. 13 years later, he would also make an appearance as Rochester in Jane Eyre (1983). Both were written by Bronte sisters: Emily ("Wuthering") and Charlotte ("Jane"). Dalton's two characters are considered to be comparable to each other within their prospective novels; it is well-known that the Bronte sisters were both inspired to create their characters by the same real man, their brother Branwell.