The building used as the house, Highclere Castle, is not only the seat of the Earl of Carnarvon who helped find Tutankhamen's tomb in 1922, but also was the filming location of the British drama Downton Abbey (2010).
Colin Firth (Adult Colin Craven) later played Colin's father Lord Archibald Craven in The Secret Garden (2020).
Colin Firth and Sir Derek Jacobi appeared in The King's Speech (2010).
Alison Doody and Julian Glover appeared in Indiana Jones and the Last Crusade (1989).
Billie Whitelaw, seen here as Mrs. Medlock, had made her screen debut playing Martha in the BBC-TV adaption The Secret Garden (1952).