Revealing mistake: When Amy comes back home from Europe she gives her parents one of her paintings as a gift. It is wrapped in lace, but in the close-up of the unwrapping, when the ribbon is removed, you see that the lace is only on top, covering the painting, not wrapped around as it's supposed to be. (01:43:55)
Revealing mistake: When John is brought to his wife who had just delivered twins, you can tell from the babies' faces that they are several days old. (01:41:50)
Chosen answer: Evangeline is their cat.