In response to Galadriel's belief that Halbrand is the exiled King of the Southlands, Tar-Míriel sarcastically suggests that "Elendil here is a Rhûnic emperor", to which Elendil responds, "Just a petty lord, actually." Elendil is destined to become the first High King of Arnor and Gondor and the ancestor of long lines of kings in both realms.
Tar-Míriel's dream of the Great Wave destroying Númenor, which Galadriel shares when she looks into the palantír, is experienced thousands of years later by Faramir of Gondor and other characters in J.R.R. Tolkien's works. The dream was autobiographical on Tolkien's part: as a young man he experienced a recurring dream of a great wave sweeping over the land, which ceased once he wrote down the story of Númenor for the first time.
When Galadriel says she has touched a palantír before, Tar-Míriel replies, "You have not touched this one," implying that the palantír always shows the same vision of Númenor's destruction. In J.R.R. Tolkien's "The Lord of the Rings," the palantír of Minas Tirith similarly becomes fixated on a single vision after Denethor's death, showing only his hands withering in flame.
Galadriel says, "Palantíri show many visions. Some that will never come to pass." In the novel of "The Fellowship of the Ring," Galadriel similarly says to Sam Gamgee concerning her Mirror, "Remember that the Mirror shows many things, and not all have yet come to pass. Some never come to be, unless those that behold the visions turn aside from their path to prevent them."
Pharazôn mentions the name of the capital city of Númenor, Armenelos. That name does not appear in the text or appendices of "The Lord of the Rings" and was first published in "The Silmarillion" in 1977. Amazon must have received special permission from the J.R.R. Tolkien Estate to use the name.