The Calculus Affair: Part 1 - S1-E12
Other mistake: When the taxi gets hit, the number plate reads "GE 7051" on the back of the car, but when the taxi falls into the water, the number plate reads "GE 7054" on the front of the car. The number plate should be the same on both ends. (00:14:55)
The Calculus Affair: Part 1 - S1-E12
Continuity mistake: When the villain runs out of Calculus's lab, he drops a box of cigars. The box is dark red when dropped, light red when Tintin notices it, and dark red again once Tintin picks the box up. (00:11:30)
The Calculus Affair: Part 1 - S1-E12
Continuity mistake: Haddock is handed a bottle of wine. His hand covers the label in the first shot, but the label faces away from him in the next. (00:05:40)
The Calculus Affair: Part 1 - S1-E12
Other mistake: The villains look at Calculus on his radio. In this shot, Calculus has a reflection in the mirror but his eyes don't seem to have a reflection at all. (00:03:05)
The Calculus Affair: Part 1 - S1-E12
Revealing mistake: The villains stand in front of Marlinspike Hall. The shot after a close-up of their feet shows the clouds along with a storm. Look to the lower left corner and you will see part of the grey cloud doesn't have any color on it, like the animation cell has been scratched. (00:02:50)
The Calculus Affair: Part 1 - S1-E12
Continuity mistake: Snowy finds a bone. He bites down on the middle of it. When Tintin takes the bone off him a few seconds later, Snowy is suddenly biting the near end of it. (00:01:15)
Chosen answer: It is a pill that makes alcohol taste disgusting.