Last episode featured the return of Winn Schott (twice), more scheming by Lex and Lena, and a set up for this second part of the story. Everyone is still settling in to the new world and their place in it, and there are various hiccups to deal with.
The Death of Superman was a major event in the comics in 1993. It hit at just the right time in a slow news cycle so that it got a truly impressive amount of coverage in the mainstream media, reaching nightly news shows and even Entertainment Tonight.
Supergirl and friends return from their weird mid-season break of timesharing their slot in the schedule with Legends of Tomorrow, which has wrapped its season.