It could have been so corny. The heart of The Peanut Butter Falcon beats to a rhythm that harks back to the ragged romanticism of a Huck Finn adventure, a time when outlaws were armed with charm rather than a tyre iron. Set in the North Carolina Outer Banks, it goes all out on bluegrass economy, a story plucked out on a twanging banjo and the audience’s heartstrings. But, perhaps against the...