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King Ottokar's Sceptre: Part 1 - S2-E4
Continuity mistake: When Tintin walks up the staircase of the Syldavian Restaurant, he stops at a door where he hears people talking about him. There is no key hole under the door knob when he stops walking, but there is a key hole when Tintin says "Sorry" to the manager. (00:06:20)