The Calculus Affair: Part 1 - S1-E12
Audio problem: When Haddock and Tintin resurface, he realises the driver and Snowy haven't. He then says "They haven't come up". His mouth is out-of-sync at least twice in this line. (00:15:20)
The Calculus Affair: Part 1 - S1-E12
Audio problem: After the bullet is shot at Calculus's hat, Tintin says "That sounded like a gunshot... outside". After he says "gunshot...", his mouth starts moving as if he is speaking before he even starts to say "outside". (00:06:40)
The Calculus Affair: Part 1 - S1-E12
Audio problem: Haddock says "Take a whiff of that fine fresh air". His mouth doesn't match what he says. (00:01:35)
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