i found myself feeling very uncomfortable with the ending *Spoilers*
Mackay took advantage of Maggie. It was really uncomfortable to watch him come on to her and initiate sexual contact and then rebuff her and sleep with her aunt later. At the very least, he could have worn a condom! He was a drifter and an alcoholic and he knew it. I felt particularly uncomfortable because the film treats the situation very positively. Can someone with an intellectual disability truly consent to sex? (i,e, was she truly cognizant of the fact that she could get pregnant or get an STD from him? Did she understand the financial undertaking of having a child and raising it on her own? Did she understand that in all likelihood, as he proved, he would not remain in the picture?) What a disproportionate power dynamic. I might have felt better if he had actually attempted to form a serious relationship with her, but it seemed more like he was drunk, horny, and lonely and available. Sex with her was a way of "cleansing" himself since he attached her to some abstract notion of purity.
In the end everyone is happy. He even shows up six months after the baby is born for a family visit! Even the aunt doesn't seem to be bothered by the fact that he screwed both of them. i think if the writers wanted to tread down that path, the story deserved a serious look at the complexities, not a glossed over fairy tale ending.