I think the best part of this movie is the pacing. It never lingers anywhere too long, always moves on to the next story within the story before it has time to overstay its welcome. Everything feels like it has its place within the story and nothing feels unnecessary.
I think the only real complaint I have about it is while the son comes around to how his father likes to tells stories while they're in the hospital, taking him along on one final journey because he knows it's what his father would love, I feel like his father could've also had a similar moment where he tells his son something, even if it's short and boring, that's straight and to the point.
And I thought the perfect situation was right there in the hospital when the doctor tells him the story of his birth in all its banality. His father begrudgingly telling him that same story, with a "There, happy now" attitude about it where he wasn't enjoying the telling of the story but was doing it because he recognizes how much it means to his son.