It starts with a minor 'thing' that turns into a full blown public row about a baked potato. Turns out Sean's character is just scared of flying, but he won't say so, so the potato is the problem. This sets the stage for some wonderfully observed characteristics of a long term relationship. Some of you, although apparently very few based on current reviews, will recognise those moments that define real love and friendship.
There's a very telling scene in a graveyard where not a word is spoken, but both are broken, sob on a bench, yet contain their grief, no touching or hugs. A dead child? We don't know.
Stolen kisses are a thing, just a quick peck in passing, but say so much.
The stilted conversation until one says what they really think opens up some otherwise guarded emotions. The daughter's awful, controlling and totally selfish boyfriend is going to be a factor. These characters don't want to hurt each other, but I think they will.
Ignore the haters, this is clever and really well observed.