The Broken Ear: Part 2 - S2-E3
Other mistake: The chess pieces Tintin and General Alcazar use during their game are all white. There are never any black pieces at all. (00:29:15)
The Broken Ear: Part 1 - S2-E2
Other mistake: The villains lower a rope with a noose in it. They place it over a man's beard they believe to be Tintin. The noose is not tight yet, but it suddenly is when they pull on the man's beard, with no way for them to tighten it. (00:17:45)
Other mistake: As Professor Fossil is on the radio, there is a shot showing us him on a newspaper. Look at the words on the article. All the words on the article are fading away. (00:08:40)
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