Land of Black Gold: Part 2 - S2-E11
Continuity mistake: When Tintin is investigating Mueller's room, he comes across a file with various articles in it. Before Tintin goes to pick up the file, the articles are on the right hand side of the file, but when he has the file in his hand, in the exact same shot, several articles have immediately appeared on the left hand side of it. (00:33:25)