https://www.hollywoodreporter.com/live-feed/greys-anatomy-cast-returns-explained-krista-vernoff-who-didnt-make-cut-same-sex-storyline-1157147

Showrunner Krista Vernoff explained the logistics of last night's final scene: "When we got our air date, which was before we had our season planned, the writer of tonight's episode, Kiley Donovan, asked to do a Day of the Dead episode because we're actually airing on the same day. I loved the idea because after 15 seasons, it's exciting to be airing on a holiday we've never done an episode about — and because it's the holiday of the community that is being attacked in our country right now by our government and misrepresented. The holiday is delightful. I had just seen Coco with my daughter — whose name is Coco — and the idea that our loved ones who died can come visit us on this one day of the year was moving."

ALSO:

Jake Borelli, AKA "Glasses," decided to come out in real life alongside his character (https://ew.com/tv/2018/11/02/why-greys-anatomys-jake-borelli-decided-to-come-out-alongside-his-character/)
Grey's producers discuss the show's first-ever kiss between two male doctors (https://ew.com/tv/2018/11/01/greys-anatomy-gay-kiss-oral-history/)