The Seven Crystal Balls: Part 1 - S3-E3
Plot hole: Two clown performers finish their act and the curtain closes. Tintin and Haddock then talk for a bit about who will be performing before the musician, but within the span of merely just a few seconds, the next act is suddenly on stage and ready to perform. No way could the clowns have left the stage and the next act have been set up within that short of a time span. (00:04:45)
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