Well, nearly all the secondary characters introduced over the course of this season have been killed off... Assuming Slade is finished off next week, plus a couple more, we have a nearly clean slate to introduce new people for what will likely be a Russia-based arc for the show..?
Also, I think pretty much everyone knows about everyone else's secret identity by now, except for newly re-minted Detective Lance (did Oliver always call him "Detective" even when he wasn't? 'Cuz he does here when he would clearly not know he'd been re-promoted). I'm glad Laurel figures it out simply by staring at Sara instead of continuing the charade on longer than it has been going already. They've been within inches of each others' eyes and she didn't figure it out then, but non-comic audiences can only accept that for so long.
And Starling City has just over a half million people in it, really? I'm not an expert on American urban centers but don't you guys peg most urban centers at well over a million these days? For all the infrastructure the city seems to have (going by all the cities that are used in its stock footage flyovers), I'd have assumed the population would be in the multi-millions. Or are they only talking about the metro area? They mention here that it seems to be a sort of Manhattan Island which is cut off when ARGUS takes the bridges and tunnels. Oddly, both Metropolis and Gotham have similar setups...
Mark