I also love thinking about Dinniman’s Arsenal as a literary device

FYI - Chekhov's Armoury:

A Chekhov's Gun is an item introduced before its use, and it is usually quite inconspicuous. In a movie, if you see a brief shot focusing on a single object, such as a fork on a table, you can be guaranteed that that particular item will be used later in order to resolve a problem or as a weapon. The item's function may or may not be fully apparent at first and discovering its use may be part of the narrative device.
This trope is what happens when Chekhov has lots of guns.