When the original actor playing Mr. Hughes died in the middle of filming, he was replaced by a double, who completed his scenes with his back mostly to the camera. Apparently, however, nobody noticed that the original actor had significantly darker hair than his replacement. Therefore, Mr. Hughes's hair turns white in several scenes, including the sequence where his wife says goodbye to him in the casino, and his confrontation with the count at the villa.
When Sergius Karamzin exits the coach, a soldier in a wheelchair is pushed past him twice - entering from the right .
When the Count seats Mrs. Hughes at the roulette table, she is wearing a different gown than the one in the rest of the scene.
When Marushka is pleading with the Count to marry her, at the start of the scene he has a black, mourning armband on his upper left arm. When a different perspective is shown, the armband is gone. A few seconds later, the armband is back, where it stays for the rest of the scene.
When Count Karamzin and the ambassador's wife, Helen, end up at Madame Garoupe's place after the deluge, in which they were forced to traverse neck-deep through a muddy swamp, the Count's clothing appears amazingly dry and spotless. His boots are still shiny, and even his cigarettes are perfectly dry.