Gil-galad addresses Elrond as "Elrond Peredhil". "Peredhil" is a Sindarin Elvish term meaning "Half-elven", referring to Elrond's mixed ancestry (both of his parents were of both Human and Elvish descent).
The walking song Poppy Proudfellow learned from her mother includes the words, "Not all who wonder or wander are lost." Thousands of years later, Bilbo Baggins will write a poem about Aragorn that includes the line, "Not all those who wander are lost."