"Sarah" shows up at the end of The Book Of Kevin.

The song was garbage, but I dig her voice.

The long take scene with Pino and Francesca is honestly the highlight of this episode.

It's definitely Jasmin singing. She also did the main solo for Miracle Day and the creepy acapella version with Liv Tyler at the end of S2.

Meg is even more dead than Evie. With Evie there's the possibility she ran off before the bomb hit. Meg was still inside the Visitor's Center per their conversation immediately before. Unless she slipped out the back or something.

On MiB/William: Angela is walking through Dolores' memories of the town before being buried. Armistice is also there being taught to dance. Angela later appears in a quick cut on her knees in tears after the slaughter.

From an interview with BD Wong after last year's finale: