When Severine goes to Duke's house to participate in a ceremony, she is wearing a brown coat. When Majordomo kicks her out in the street later, he throws her a completely different black cloak.
Marcel breaks the glass and oval frame to vent his anger. The same frame and picture are unbroken later.
When Mr. Adolphe first unzips Belle's dress, she has a slip under it, but when she rushes out and then comes back in, Adolphe unzips her dress again, and she isn't wearing the slip anymore.
When the client that wants to be spanked rejects Belle Du Jour, she puts her robe back on but not her bra. Then when she sees the Asian client a few moments later, she takes off her robe, and her bra is on.
When Pierre and Severine kiss goodnight, the position of the pillow behind her neck changes.
Subtitle of a newspaper: 'Harold Tribune' rather than Herald Tribune.
When Severine and friend are in the cab, the projected background in the cab does not match the exterior as seen when Severine gets out.
As Husson leaves the Serizy apartment at the end and closes the door, he wall can be seen to shake.