When Carnahan hits Tassuma for the second time, Tassuma points to his left eye. Carnahan then punches with his left arm which should have hit Tassuma's right eye. Afterward Tassuma holds his left eye in pain.
Carnahan says to Luana that the Earth is moving toward the Sun at the rate of a half an inch a century. In fact, the Earth is in a stable orbit that, over an astronomical time scale, in fact, will move away from the Sun. As the Sun loses mass fusing hydrogen into helium, the Earth's orbit will increase by a minuscule amount; approximately 150,000 kilometers over approximately the next 5 to 6 billion years.
When the Stewart character is paying off Gruber in gold bars the bars are very easily lifted and don't depress the spring scale being used very much. In reality, estimating the bars conservatively as 8x3x4 inches, a relatively pure gold bar of that size would weight about 65 pounds.
Valentina Cortese is credited as 'Valentina Cortesa'.
One scene features wild chimpanzees. Chimps are natives of Africa, not Malaya.
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