When Renato pours champagne for Laurent, his glass overflows with champagne and foam, but when the camera cuts to Laurent after Renato asks his fiancee's name, the glass he is holding is empty. In the next shot, the glass is full to the top with champagne again.
When Renato finds Albin on the bench at the train station, he sits down on the bench. But when the shot changes, Renato has suddenly moved closer to Albin.
Camera shadows at certain points of the opening sequence with the dancers.
When Renato has a negotiation with Mercedes, the camera's reflection is visible in the left hand corner of the vanity mirror.