The Blue Lotus: Part 2 - S1-E9
Other mistake: There is an outside shot of the police station. There are several "+" signs on a brick wall in front of the wall to the building. However, not one part of the wall or window is seen through the "+" signs on the wall in front of the building. Just some green wall. (00:32:35)
The Blue Lotus: Part 2 - S1-E9
Other mistake: Professor Fang's note given to Tintin doesn't actually have writing on it, yet Tintin still reads it anyway. (00:29:15)
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