但李善德为了保住自己的小命，也为了家人，不得不想尽一切办法攻克这个前人从未实现的难题。小说主题脉络清晰，以悬疑贯穿始终，从“运送荔枝”这件苦差事，揭露封建王朝的腐败，同时也从侧面呈现出大唐由盛而衰的历史图景。
大鹏改编的电影，亦同样遵循小说的故事线，整体情节和大方向都没变，只是对一些人物和故事做了细微的改动和调整。有几处改动，皮哥觉得非常精妙，便故事比原著圆满了不少。
比如广州胡商苏谅（白客饰演），原著中是个老商人，影片中为了迁就白客的形象，改成了中年人。苏谅为了换取李善德手中的五府通行符牒而为李善德提供了资金支持，两人在合作中建立了亲密的关系。
但后来因李善德未能履行让苏谅报效朝廷的承诺，而导致两人关系破裂。原著中苏谅因被官府通缉而驾船逃走，其后再无登场，电影中给他加了戏，让他在最后李善德转运荔枝的关键时刻又出现并帮助了他一把，让这个人物有了一个更好的结局。
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