Tonight's Legends of Tomorrow episode (season 5, ep 8: Zari, Not Zari) had a nice reference/homage to Supernatural.
Slight spoiler ahead:
Since Supernatural is ending, I guess they figured they could close the door on possible crossovers by confirming that Supernatural is just a TV show in the Arrowverse. Especially since post-Crisis they've eliminated all the parallel Earths.
Slight spoiler ahead:
Since Supernatural is ending, I guess they figured they could close the door on possible crossovers by confirming that Supernatural is just a TV show in the Arrowverse. Especially since post-Crisis they've eliminated all the parallel Earths.