Tintin in Tibet: Part 2 - S2-E7
Other mistake: Haddock becomes exhausted and sits down. Tintin points out he'll freeze. Watch the two horizontal strips along the middle of his jacket. They are yellow for a few frames, then they go to blue for a few frames. Then if you look super carefully, you'll see that the two straps vanish from shot for a quick frame. Then they reappear. (00:29:10)
Tintin in Tibet: Part 2 - S2-E7
Other mistake: As Tintin, Haddock and Tharkey set up camp, Tintin gets blown back by the tent. Tintin starts running as he is pulled by the tent and trips once he lets go. You'll notice that there is a huge skid mark from his landing on the ground before he does so. (00:28:30)
Tintin in Tibet: Part 2 - S2-E7
Other mistake: When Tintin is running as he is being dragged by the tent, he leaves no footprints in the snow. (00:28:25)
Chosen answer: It is a pill that makes alcohol taste disgusting.