Not sure if this needs a spoiler thread or not, but I did have one thing...not particularly a spoiler but might as well ask here.
So the scene when Masons Sr. and Jr. go camping and are by the lake, it sounds like it is ADR. It especially sounds that way because Mason Jr.'s voice is super low even though he's only like 13 at that point.
Then again, last time I visited my 7 yo nephew he had a cold and his voice sounded lower than mine.