Land of Black Gold: Part 2 - S2-E11
Other mistake: When Snowy discovers the blue robe, Tintin picks it up. As he kneels down, he is doing the motions of reaching for the ground and picking up the robe, but the robe is significantly further away than where he is reaching down for. (00:26:15)
Land of Black Gold: Part 2 - S2-E11
Other mistake: When Tintin and the Emir are talking with the military adviser, the Emir holds a box of cigars and lets the military adviser take one out of the box. The military adviser then takes out one of the cigars from the box, but the amount of cigars in the box remains the same. (00:27:50)
Land of Black Gold: Part 2 - S2-E11
Other mistake: When Mueller is at his desk, writing, a fly comes into his view. Just before the fly appears in view of him, he is writing on his paper, but he is just shown writing in the exact same spot and nothing ever appears on the paper. (00:33:55)
Chosen answer: It is a pill that makes alcohol taste disgusting.