What's an "Arrowverse"?
The DC-comics-based shared universe on the CW that started with the show Arrow and has since expanded to include Flash, Legends of Tomorrow, and as an alternate-universe-but-occasional-crossovers-through-dimensional-travel companion piece (because it started out on CBS and moved to CW in its second season), Supergirl.
I'm actually getting a little tired of how virtually every Arrowverse episode needs to end with a cliffhanger setup for the next episode, even if it's an unrelated story. That's the sort of thing that I think should be saved for when it really matters.
Oh, that's an annoying approach to it, yeah. I'm still about a season behind, I think, and I must not have reached them doing that sort of thing yet.