Well, 'Sloop John B' is believed to have originated from the Bahamas and has gone through various interpretations over time. Some say it tells of a sailor's adventures and misadventures on a sloop.
Well, it's a mystery. Maybe it's his real hair styled differently for the movie, or it could be a hair enhancement. There's no definite answer available.
John B Keane's short stories are often rich in Irish rural life. They vividly depict the local characters, their dialects, and the simple yet profound way of living. His stories can be both humorous and poignant, showing the real nature of human relationships in that setting.
Family - related themes can be found as well. For example, how they interact with each other's families, or how they build a family of their own in the fanfiction world. This can add an extra layer of depth to their characters and the story.
Fanfiction.net is also a good place. There are many different categories and tags that can help you narrow down your search for John B and Sarah fanfiction. However, the quality may vary, so you might need to do some browsing.
Their hair could represent their relationship in many ways. For instance, if they often fix each other's hair, it shows their closeness and care for one another. If their hair is always intertwined in some way in the descriptions, it could symbolize their deep bond, like two parts of a whole.