Destination Moon: Part 2 - S3-E10
Revealing mistake: When Calculus is showing Tintin and Haddock around the rocket, they are in the deck below. Tintin and Calculus have already climbed down the ladder and Haddock is still climbing. Whilst Haddock is climbing down, the button on the back of his space suit vanishes for one frame. (00:31:50)
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