* AuthorExistenceFailure: Tolkien died before he could finish it. (But he spent years and years fiddling with the stories, so the published version is an editorial creation, assembling together various texts into a readable version that doesn't contradict itself.)
* WordOfSaintPaul: Christopher Tolkien's commentaries and edits on posthumous works. Also his version of the war between Doriath and the Dwarves, which his father never got around to writing.
!!Tropes inspired by this work:
** Music/BlindGuardian's ''Nightfall in Middle-earth'' is [[SugarWiki/AwesomeMusic a concept album]] based on the Silm.
** Epidemia's "FŽanor."