Continuity mistake: Whilst examining the wrapper with "Karaboudjan" written on it, the "K" is a centimeter away from the letter "A" and all the other letters are about a fifth of a centimeter away from the letters. Tintin then places a magnifying glass above the word "Karaboudjan". After doing this, the "K" that was a centimeter away from the "A" is now a fifth of a centimeter away from the "A", but none of the other letters seem to have changed distances.
Continuity mistake: When Tintin meets up with Thomson and Thompson at the market, the detectives have tanned skin. The shot cuts to Tintin asking the two of them "A little Sunday shopping?" and then cuts back to a shot of all three of them. In the shot where it shows all three of them, Thomson and Thompson's skin is suddenly much paler, while Tintin is darker.
Continuity mistake: Whilst at the market, Tintin meets up with the detectives Thomson and Thompson and the detective on the left says "Good to see you again." The detective on the right is holding four canes. In later shots he's holding five, then six.
Continuity mistake: When Thomson and Thompson mention they just happened to notice these splendid sticks, the detective on the left is holding his cane around his right wrist. Two quick cuts later and and the detective's cane is suddenly held around his left wrist.
Continuity mistake: When Tintin is about to buy the model Unicorn, there is an antique sale visible in the background. When Tintin says "Will you take 20 dollars?", a grandfather clock is shown, displaying 5:05. A couple of shots later, Sakharine pushes Tintin out of the way and the time suddenly changes to 2:00.
Continuity mistake: Tintin is cleaning his apartment after it had been ransacked and is hanging a painting on the wall. From the wide angle, the skyline on the painting shows a clear blue daytime skyline. The shot cuts to a closer angle of Tintin, and the painting suddenly shows a dark blue near night time skyline.
Other mistake: When Tintin discovers the scroll under his drawers, he begins reading the French words on the scroll in English. He starts reading out by saying "Three brothers joined." This sentence translated into French would be "Trois freres rejoint." However, this is not what is shown on the scroll. The sentence shown on the scroll appears to be "Trois freres unys."
Continuity mistake: When Captain Haddock shows Tintin the journal that belonged to Sir Francis Haddock, it's brown. Much later on in the episode, after Haddock has finished telling Tintin about the story of Francis Haddock, the journal is suddenly much lighter.
Continuity mistake: When the pirates are partying, one of them throws a wine bottle towards the tied up Francis Haddock. One of his hands is shown tied and wrapped in ropes. The shot then switches to a close-up of his hand, which is now wrapped around the ropes tying his body to the mast, and not the other ropes shown a second ago.
Revealing mistake: Francis Haddock lowers himself from the ropes to the lifeboat below. He steps foot inside the boat, but the bottom of his legs and his feet are still perfectly visible when they should have been covered up by the boat. This error in the animation makes the boat appear as if the boat is missing one of its sides.
Continuity mistake: Tintin, Haddock and Snowy are walking down the street and Haddock says he's going to be rich and tosses his hat in the air. There is a lamppost right next to Tintin. A man then opens his window, telling Haddock to keep the noise down and Tintin is suddenly standing about a foot away from the post.
Continuity mistake: When Tintin, Haddock and Snowy are walking down the street, they stop walking for a moment next to a lamppost. The shadow of the post is first cast across the building next to it. About two shots afterwards, the shadow is suddenly cast on the sidewalk directly in front of it.
Continuity mistake: Thomson shows Tintin that he has had an elastic band attached to the wallet in his pocket as an attempt to catch the pickpocket. When they first use, the wallet with the elastic band is in Thomson's right pocket. In the next scene, when the pickpocket attempts to steal Thomson's wallet, it is now inside his left pocket.
Continuity mistake: Tintin, Haddock, Snowy and the detectives are back at the office after getting the pickpocket's coat and Tintin's wallet. Tintin opens his wallet and takes out the scroll inside it. When he takes out the scroll, the scroll is smooth and undamaged. He then hands the scroll to Haddock and it is suddenly tattered.