The irony of violent accidents
The irony of the gun incident is that Trond was not trying to do anything evil. He was just curious about guns because his dad was at war, and during play, he shot a friend in the head. The scene's horror speaks for itself, and so does the irony. A boy accidentally killing while his father purposefully kills Nazis; an innocent young person permanently scarred by the knowledge that he has caused true agony to his community, and taken a life.
The irony of the Norwegian countryside
The country in Norway is truly sublime, and Trond finds a kind of irony in nature, because he knows that what he really wants is to be united with his community by true acceptance, but in nature, alone, he does feel united and in communion. Ironically, he has found something in isolation that has healed him—but the problem is that it also set him up to suffer alone his whole life and to die alone.
The irony of loneliness
Trond might feel as though his life's circumstances were responsible for his loneliness, but we know from dramatic irony that his father was also extremely lonely, because he suffers PTSD that no one understands in his community. Not only do they underestimate the actual horror of modern warfare, but also PTSD is death fear, so Trond and his father are ironically not alone, because secretly, they are on similar journeys, shown in the final imagery of them riding stolen horses together.
The irony of PTSD
PTSD is dramatic irony, because Trond's father understands what PTSD refers to, but other people don't. They might understand how scary war is, but they weren't there to see flying war machines and tanks. The irony of Trond's father's PTSD is that it refers to horror that the world has never seen before, but in another way, it is only death that he fears, which is perfectly universal.
The irony of Lars
Ironically, this dying man is given a friend in old age. Trond is forgiven for his boyhood mistakes, which is a burden he had carried so long he could not imagine. At dinner, Lars and Trond admit they know who the other is, but after all, they share dinner and they work together to clean up. Even though they cannot find words worth speaking to each other, they are together.
