Tanks For The Memories - S5-E15
Factual error: Tim accidentally fires an M2 .50 machine gun while on a tank. Ricochets are shown sparking all over other tanks while people dive for cover. A) Bullets don't spark when they ricochet, and B) the M2 had a blank firing adapter installed; it couldn't have been firing bullets.
The Seven Crystal Balls: Part 1 - S3-E3
Factual error: When Tintin and Haddock are watching the two clowns performing on stage, the clown of the left is shown stepping in a spilt puddle of water on the stage, but the water is never affected, even when he steps in it. The water just remains completely still and no water is ever shown dripping off the clown's shoe. (00:04:40)