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90版电影比较重要的跟原著不同的地方三：
"On Mars," Quail said hoarsely,"I killed a man. After getting past 15 bodyguards. Some armed with sneaky-pete guns, the way you are." He had been trained, by Interplan, over a 5 year period to be an assassin. A professional killer.
电影版中，奎德并没有在地球上回忆起这么多火星上的事，而且电影中他的真实身份跟小说中也不同。