Re: What episode is the most unreferenced?
DS9's "Armageddon Game"?
One of the endgame body armors in STO was originally going to be called Kellerun. Didn't happen, though.
Aside from that I can't think of any further reference to the Kelleruns, T'Lani or harvesters. Maybe Miles's coffee habits?
1.000 years: University Leipzig, 1409-2409
Gorn to be wild!