The Calculus Affair: Part 1 - S1-E12
Revealing mistake: The villain holds a syringe and some liquid comes out of it. It's plainly visible that there is no liquid in it. Syringes are see through - we should have seen the liquid. (00:06:05)
The Calculus Affair: Part 1 - S1-E12
Revealing mistake: Tintin says to Professor Topolino it wasn't Calculus who tied him up. The next shot shows a timer on a bomb ticking. As each second ticks, the minute hand on the clock keeps ticking backwards or forwards. (00:17:50)
Answer: According to Wikipedia, he is described as being a youth anywhere from 14 - 19 years old. There is no specific age.
raywest ★