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: Tintin is on a train, reading a newspaper saying Sanders is in a deep coma and the man next to him says there'll be more to come. When the man starts talking, he is seen with a pipe in his mouth, but in the next shot, the pipe is suddenly longer.
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.
Plot hole: Two clown performers finish their act and the curtain closes. Tintin and Haddock then talk for a bit about who will be performing before the musician, but within the span of merely just a few seconds, the next act is suddenly on stage and ready to perform. No way could the clowns have left the stage and the next act have been set up within that short of a time span.
Continuity mistake: After General Alcazar performs his knife throwing act, Tintin says he knew General Alcazar in South Africa. At this moment, Alcazar is onstage standing on his own, but in the next shot, a stage hand has suddenly appeared onstage beside him. The knife holster has also suddenly reappeared onstage.
Continuity mistake: At the theatre performance, Ragdalam the Fakir is shown putting Madame Yamilah into a state of hypnosis. When Ragdalam starts telling Madame Yamilah that he is putting her into a state of hypnosis, she is facing the audience, but in the next shot, she has suddenly turned 90° to face Ragdalam.
Continuity mistake: When Tintin tells Thomson and Thompson that they should warn the other members of the expedition, Tintin places his left hand on his phone and pushes it to the other side of the table. In the closeup, it's now his right hand, and the telephone wire moves too.
Continuity mistake: When Tintin goes to phone the members of the expedition, he places his address book beside the phone a few inches from it, and the phone is near the centre of the table. In the next shot, the phone and the address book are suddenly nearer to the edge of the table.
Revealing mistake: Tintin, Haddock and Professor Calculus are driving to the last professor's house and Haddock is the one driving. All three of them get out and walk to the gate, but even though no-one else is inside the car, a pair of hands can still be seen holding the steering wheel.
Audio problem: When Tintin, Haddock and the detective go into Tarragon's bedroom to discover him just sleeping, Tintin steps on a few broken shards of crystal. The sound effect used of the crystal shards breaking is too loud considering the shards of crystal shown were far too small to make such an audible crunching sound.
Continuity mistake: Tintin, Haddock and Snowy are searching for the intruder and the intruder is pointing a gun at them from inside a shed. From the inside shot, Tintin is walking past a tree with a small branch hanging from the side of it. When Tintin is shot at, he is suddenly standing right beside the tree.
Revealing mistake: When the detective is phoning the police about the black sedan, a man sitting at a desk is writing the details. He is writing on four lines of paper, but after writing the first three lines, he is just writing over the third line for a second time and the fourth line of writing suddenly appears on the paper.
Continuity mistake: When the police officers are telling Haddock that they have lost track of the intruders, Tintin inspects a tree with a scratch mark. In the first shot, he is inspecting the scratch mark with one finger, but in the next shot, he is suddenly using his entire hand.