Revealing mistake: When Tintin discovers that Rastapopoulos is on the island, Tintin's arm has been animated differently than his face. Tintin's arm appears visibly more tanned than his face is. (00:11:05)
Revealing mistake: When Carreidas tells Rastapopoulos that he is mad and Rastapopoulos replies "No, just well informed", Rastapopoulos begins to walk around Carreidas. As he is walking around Carreidas, the cigar in Rastapopoulos' mouth clips through the string in his monocle. (00:11:50)
Revealing mistake: After Rastapopoulos tells Tintin he should have stayed on Flight 714, he says all he wants is Carreidas' money. When he finishes the line, the cigar in his mouth literally flickers from the left side of his mouth, to the right side of his mouth without him moving it. (00:11:45)
Answer: According to Wikipedia, he is described as being a youth anywhere from 14 - 19 years old. There is no specific age.
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