In "The Hat," author Stephen Bachman is a reference to Stephen King and his pseudonym Richard Bachman.
In the segment The Hat, the Grantham Family Ashtray can be seen in a display case in the publisher's office on a shelf below Stephen Bachman's hat.
At the end of the episode as the comic pages flip each page shows an illustration of a previous episode. This time those depicted are: Pesticide (2.2B), The Companion (1.4A), Night of the Paw (1.5A), and Times is Tough in Musky Holler (1.5B).
In the segment Grieving Process, the Grantham Family Ashtray is on a low shelf in the basement across from the laundry units holding what may be a candle. (0:51:43)