The Seven Crystal Balls: Part 1 - S3-E3
Revealing mistake: When General Alcazar introduces his act, a stagehand appears behind Alcazar, to set down the knives for his act. The stagehand is never seen walking into and entering the frame. He just randomly appears on screen. (00:05:00)
The Seven Crystal Balls: Part 1 - S3-E3
Revealing mistake: When the theatre announcer announces Bianca Castafiore, Castafiore is shown walking onstage to perform. There is no animation seen of Castafiore walking into the frame, she just randomly appears in the shot. (00:07:10)
The Seven Crystal Balls: Part 1 - S3-E3
Revealing mistake: After the announcer at the theatre goes to leave the stage as Bianca Castafiore walks onstage, no animation is seen of him leaving the frame, he just randomly vanishes from the shot just as he is about to exit the frame. (00:07:15)
The Seven Crystal Balls: Part 1 - S3-E3
Revealing mistake: Tintin, Haddock and Professor Calculus are driving to the last professor's house and Haddock is the one driving. All three of them get out and walk to the gate, but even though no-one else is inside the car, a pair of hands can still be seen holding the steering wheel. (00:15:50)
Chosen answer: It is a pill that makes alcohol taste disgusting.