Influenced Matt and Ross Duffer (the Duffer brothers) in their creation of the Netflix series: "Stranger Things", which has a similar plot.
The title "Elfen Lied" is actually German. "Lied" is pronounced leet not lah-yd.
Lucy's original design was dark brown hair, blue eyes, and sharper horns.
Elfen Lied means "song of elves" in German.
Elfen Lied is based on Lynn Okamoto's seinen manga series of the same name and premiered while the manga was still in publication. The anime follows the source material through the first 7 volumes, with several alterations to the story, and concludes with an exclusive ending. In an interview, director Mamoru Kanbe expressed his disappointment in having to 'condense' to story into 13 episodes and felt that more were needed to include significant plot details that would have made the series more emotive.