Instead of immediately helping Mrs Oliver with the Ravenscroft case, Poirot instead chooses to investigate the murder of Dr Willoughby's father, which is a subplot that is not in the novel; as a consequence, Dr Willoughby's character is greatly expanded.
Elephants Can Remember was adapted for radio by BBC Radio 4, featuring John Moffatt as Poirot and Julia Mackenzie as Ariadne Oliver, Joan Hickson appeared as Oliver's former governess.