The theme "don't judge a book by its cover" is illustrated in Seedfolks through characters like Ana and Royce. Ana initially suspects a Vietnamese girl of criminal activity but discovers she's planting beans, leading Ana to reassess her judgment. Similarly, the community gardeners initially fear Royce due to his appearance but later learn he is kind and trustworthy, changing their perception. These examples highlight the importance of looking beyond appearances to understand people's true nature.