The Crab with the Golden Claws: Part 1 - S1-E1
Other mistake: When Tintin discovers the torn out part of the wrapper, Tintin asks "What are these?" and one of the detectives reply "Objects found on a drowning victim." At this moment, the Thompsons are shown holding six files in their hands, but the way they are shown holding it would never be possible. This is mainly due to the fact that the second file is located on top of another file to the left, but there are four others on top. These four files are creating too much weight and would have fallen over. (00:03:35)
Chosen answer: It is a pill that makes alcohol taste disgusting.