Mom crying in bed
It might not seem as much now, but the movie has something of a risque scene.
When the father comes, there is a scene with the parents alone, and the father joins his wife on the bed & they kiss. But, then he stops, saying something like "can't make love while you are crying."
As I recall, there were still two beds in the room, but a blatant reference to having sex like that is notable even for the early '60s.