The unfinished story The New Shadow hints at a renewal of Morgoth-worship during his reign.
In Peter Jackson's movieThe Lord of the Rings: The Return of the King, Arwen is on her way to the Grey Havens to leave Middle-earth and Aragorn when she has a vision of Eldarion (although not named in the film), which persuades her to stay. This is a major departure from the events in the novel. Eldarion is played in the film by Sadwyn Brophy.