Warning! SPOILERS about Not Dead Yet episode 4 ahead.The ghosts’ appearances on ABC’s Not Dead Yet have typically and consistently been comedic in tone, but one ghost appearance in Not Dead Yet episode 4 broke away from the routine, referencing a heartwarming and wistful 2019 romantic comedy. Not Dead Yet’s protagonist, Gina Rodriguez’s Nell Serrano, is only assigned to the obituary beat to help her get her life back on track after her fiancé, for whom she moved across the world, left her. However, the obit beat grants her the unprecedented chance to talk to her subjects and gain wisdom from them, as they would appear only to her until she completed and sent in their obituaries.

https://screenrant.com/not-dead-yet-episode-4-last-christmas-reference/