Land of Black Gold: Part 1 - S2-E10
Character mistake: The man who escorts Tintin into the Emir's office asks Tintin if he is here about "today's events in the market" (referring to Thomson and Thompson crashing their jeep), to which Tintin replies "Yes", but seconds later, when Tintin is explaining his reasons to the Emir for visiting him, he states the events with the jeep occurred yesterday. (00:19:20)
Chosen answer: It is a pill that makes alcohol taste disgusting.