The Secret of the Unicorn: Part 2 - S1-E4
Character mistake: Mr. Silk has a collection of the wallets he has stolen and has sorted them on shelves by alphabetising them. Each shelf takes two letters of the alphabet, which is where the name of each owner's wallet would be placed on the shelf as shown by tags at the top of each shelf. Tintin finds Max Bird's wallet on one of the shelves and the shelf next to has a tag reading "Q-R." This implies that the shelf with Max Bird's wallet must have a tag reading "O-P" since O and P come before Q and R in the alphabet. Shouldn't Max Bird's wallet be located on a shelf with the letter "B" representing "Bird" or "M" representing "Max"? (00:42:20)
Chosen answer: It is a pill that makes alcohol taste disgusting.