The Broken Ear: Part 2 - S2-E3
Other mistake: In a flashback of Lopez stealing the gem stone, he places the idol in his bag and closes it. If you watch the idol as it closes, an animation error occurs where it vanishes from shot just before the bag finishes closing, revealing that the animators forgot to draw it in each individual frame. (00:39:10)
The Broken Ear: Part 2 - S2-E3
Other mistake: The chess pieces Tintin and General Alcazar use during their game are all white. There are never any black pieces at all. (00:29:15)
Chosen answer: It is a pill that makes alcohol taste disgusting.