The Castafiore Emerald: Part 1 - S3-E7
Continuity mistake: After Haddock tells the gypsies that they can camp near Marlinspike Hall, Tintin and Haddock return to the manor. As they walk up the stairs, Haddock has his cane in his left hand, but when they walk through the door, Haddock suddenly has his cane in his right hand. (00:03:35)