If you are going to make a movie about an elderly Irish farmer who thinks his unmarried son Anthony (Jamie Dornan) is too weird to take good care of the land for him when he dies, that farmer had better be Christopher Walken. Because, why not. It doesn’t even matter about the accent, which he gives the old college try. The scenes between Walken’s character Tony Reilly and Dornan give us some of the sharpest moments in this otherwise largely saccharine effort from screenwriter and director John Patrick Shanley, adapted from his 2014 play Outside Mullingar. Antony spends the movie in one of the most agonizing courtships in movie history with Rosemary, played by Emily Blunt. Blunt’s sly humor redeems a flimsy role, which in lesser hands might easily have read as a vehicle for being seen a lot on horseback over the course of a film. The American cousin to whom old man Reilly considers signing over the farm instead of Antony is played by Jon Hamm. I would love it if this were the movie that discovered the gifted character inside Hamm’s body, like Burn After Reading did for Brad Pitt, but this isn’t that movie. There is a wonderful scene between Hamm and Blunt, where he condescends to her for holding on too long to childish romantic fantasies. Blunt replies, shrewdly, that he is a New York City banker who wants to be a farmer in Ireland and shouldn’t talk. But these are glimmers. By the time Antony and Rosemary’s oh-so torrid passions have achieved any specificity, we are well into the second act and have looked at a lot of cows for no reason.