I didn't realize it, but this is the episode I've been waiting a long time for-- we get to know more about Sister Evangelina, and she gets acknowledgement she so richly deserves! We got hints of her background in that first Christmas episode, but I think her feature episode is long overdue. I also wonder what she would think of me if I were a midwife at Nonnatus (what, doesn't everybody do that?) and my hope is it would start out very Trixie-like, and end up very Trixie-like. I love how that relationship has progressed.
I also liked all the callbacks in this episode-- Jenny's time at the London with Patsy, (who I did not expect to like but happily liked her immensely as a character and as a part of the group) the home where the couple nearly placed their baby born with spina bifida, Sister Monica Joan's tendency to wander off-- and many more. I love that we know these characters so well that these little things stay consistent and can just be referenced in one little scene. Although I wish some scenes weren't *quite* as little-- I'm really irritated PBS cut the Shelagh/Sister Evangelina scene short!