Red Rackham's Treasure - S1-E5
Continuity mistake: When Tintin and Haddock discover Calculus had been sleeping in one of the lifeboats, he wakes up and tells him he slept rather badly last night. Tintin and Haddock are standing beside each other, with Tintin partially behind Haddock. In the following shot where Haddock replies, Tintin has vanished from beside Haddock. (00:09:45)