The Calculus Affair: Part 1 - S1-E12
Revealing mistake: The villains stand in front of Marlinspike Hall. The shot after a close-up of their feet shows the clouds along with a storm. Look to the lower left corner and you will see part of the grey cloud doesn't have any color on it, like the animation cell has been scratched. (00:02:50)
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)
Chosen answer: If Hector was seriously intent on removing King Ottokar's scepter from the glass cage holding it and launching it through the window with the camera, then Hector would have been forced to knock out the two guards so they would not have interfered with Hector's plan as soon as he removed the scepter from the glass. As for Hector, himself, was explained when Tintin was explaining how Hector stole the scepter. Tintin placed a twig inside the camera and it launched out of the camera. Hector would have placed the scepter inside of the camera, and would have been knocked unconscious due to the spring effect created when the scepter had been launched.
Casual Person