Prisoners of the Sun: Part 1 - S3-E5
Other mistake: After the man on the ship tells Tintin that Calculus' punishment is death, he yells for Alonzo, and Tintin then punches him. When the man is punched, it is apparent that Tintin's fist never even enters the frame. There appears to be a flash effect indicating that he had been punched, but Tintin's fist is never shown hitting him. (00:07:05)
Prisoners of the Sun: Part 1 - S3-E5
Other mistake: After Tintin unties Haddock, he jumps up, taking off his poncho. He then throws the poncho into the air, but it is never seen again, nor is it ever shown falling onto the ground. (00:18:20)
Chosen answer: It is a pill that makes alcohol taste disgusting.