The Seven Crystal Balls: Part 2 - S3-E4
Factual error: The shed that the intruder fires at Tintin and Haddock from has a lock shown on the interior side of the door, but no lock shown from the exterior side of the door. (00:30:15)
The Seven Crystal Balls: Part 2 - S3-E4
Continuity mistake: When Haddock kicks the hat laid on top of a brick, the brick is right next to a railway track, but when Haddock yells out "Hooligans" to the kids and picks up the brick, the brick is much further away. (00:39:50)
The Seven Crystal Balls: Part 2 - S3-E4
Continuity mistake: When Professor Calculus walks up to Tarragon's room, he is asking "Is Hercule in?", standing with in the doorway. In the next shot, he is suddenly standing entirely outside of the room and the detective is in the doorway instead. (00:27:25)
The Seven Crystal Balls: Part 2 - S3-E4
Continuity mistake: When Tintin says "The curse of Rascar Capac has come true", the detective has black hair and a black moustache, but in the next shot, his hair and moustache are now a much more reddish-brown colour. (00:25:10)
Chosen answer: It is a pill that makes alcohol taste disgusting.