During the funeral scene, Edmure begins with four arrows. He shoots three and is shown with one left. When Bryndan Tully takes over and takes an arrow, Edmure has two arrows and is shown with one left a second time.
Tyrion states "We owe them [the Iron Bank of Braavos] tens of millions". In Lord Snow (2011), it is mentioned that Crown is six million Gold Dragons in debt, half of it to House Lannister; therefore, the debt to the Iron Bank cannot be more than three million Gold Dragons.
Robb tells Edmure: "Do you think he'll [Tywin] sue for peace because we have his father's brother's great-grandsons?". Willem and Martyn Lannister are not Tywin's father's brother's great-grandsons - they are his nephews, sons of his brother Kevan.