Chekhov's Gun
Showing an object or detail early on that becomes important later. The idea is that nothing gets screen time unless the story is going to use it.
The Counselor
At a party early on, the dealer Reiner describes the bolito, a device that tightens around a person's neck and decapitates them. It sounds like a story told for color. Later, Malkina has Westray killed with it. The film gives the object screen time because it will use it.
Get Out
The cotton stuffing in the chair's armrest, the deer antlers, Rod's TSA job and the camera flash on Chris's phone all show up along the way. Each one ends up being something Chris needs to survive.

