Tree watching a video of a birthday she spent with her mother before she died.
Tree finally having lunch with her father and opening up about how she avoided him as a way of not having to cope with her mother's death.
One timeloop has Tree doing her damnest to be the nicest person she can. But then she dies. So nobody remembers. However, most of the actions are repeatable, and we can assume that she takes a similar course of action in the final loop once the true killer has been apprehended.
