This is the first (and up to now only) episode of the JLU series, that refers to the "Old Ones" - a race of gods created by HP Lovecraft.
Referenes like these are usually made in the Batman series so I've been fairly surprised as I saw the episode for the first time.
The bad thing is: the only TRUE reference towards HPL is the title.
Everything else is either spelled wrong (like "Cthulhu"), wrong references are made (Cthulhu is a BIG OLD ONE, here he seems to be a OLDER GOD), the language Fate uses clearly is everything but the MYTHOS language ... and why didn't anyone come up with the idea to ask Bats or Etrigan for help?
Both are familiar with the the Big Old Ones.
But just mentioning Lovecraft's worth 9.5 *g* ... and it's obvious that they at least tried ...