Some subtext is only speculative, and some comes from first hand sources such as interviews and DVD Commentary. Either way, it is either not intentionally called out within the work, or the reference is oblique except to those who are "in on it". See "Funny Aneurysm" Moment, Harsher in Hindsight, Heartwarming in Hindsight and Hilarious in Hindsight for the accidental versions of this, as Reality Subtext is at least semi-intentional.
Maybe the author or actor is having relationship issues, or drug issues, or got pregnant, or someone close to them died.
Git was originally commissioned as a 30-minute segment of the digital omnibus film 1.3.6.
Comprising works by Jang Jin (Someone Special), Lee Young-jae (Harmonium in My Memory) and Song, 1.3.6 was intended to explore environmental themes and was slotted to open the first Green Film Festival in Seoul in late October.
Or something major happened in the world: a disaster, a war, the death or birth of a public figure, a chaotic political climate, what have you. All we have to decide is what to do with the time that is given to us.
Often these events have an effect on the work, but not one that is visible to the viewer or reader unless they are privy to that outside knowledge. There are other forces at work in this world Frodo, besides the will of evil.
Alas, the festival's expectations were confounded, first in that only Lee Young-jae's work really engaged environmental issues in a direct way (the other two were merely set in rural areas), and second by the fact that Song went out and shot a 70-minute film.