- Abra taking on Emerald's appearance when Rose entered her mind makes sense largely because Emerald's semblance is illusions.
- Azzie, the hospice's cat, has the habit to visit patients whose death is imminent. One evening, Dan notices Azzie enters a room and points there's currently no patient in this one, yet Dan follows Azzie anyway, where he meets Dick Halloran's ghost and chats with him. Among other things, Dick tells Dan he won't visit him anymore, so... in a sense, Azzie did announce a (metaphorical) death.
Fridge / Doctor Sleep