In fact, what "was" there, is pretty much wild speculation. Because our readers wonder if I got a head injury or something if these Easter egg columns don't run.
So...what did we get?
Read on, and let us know if we missed anything.
The Ogre has been the name of a few DC Comics villains, neither of whom is related in any way to Jason Lennon.
It's wildly unlikely that there is any real connection here, but one of the people Fish names on the island shares a name with numerous generic, minor villains from the comics (Batman, Catwoman, Superman and Checkmate all had separate baddies with that last name) as well as TV (Smallville and Arrow).
Again, the odds that it's ANYTHING are basically zero, but Caitlin Fairchild is a major player in DC's Wildstorm imprint. Her father is a major character but as far as I know her mother is basically anonymous.
Again, there are a pair of minor Batman villains from very early issues who have the last name Mathers, but no real indication that it's the same Mathers who's mentioned in the show.