I think what you write about Trevor is the main focus of the film. I also had such thoughts during the film, and I remember a lot of situations like the ones you described (though no 25+ years in my case ). I think that no thing is ever forgotten, neither by body nor mind. It only changes in relation to our lifes and the way we deal with it. 

I think I discussed the film with Anasazie on the Haneke threasd at the director`s board. That`s why there is also no comment by me.

Going by preference from the 5 Haneke films I`ve seen, it is right in the middle, suggesting that Haneke is one of the most significant filmmakers of our time.