The sister takes the sheet from one of the chairs twice as she uncovers the furniture.
Director Thomas Vinterberg broke the rules of his own Dogme 95 Manifesto by covering up a window with an outside prop (forbidden by rule 1) in order to create special lighting (forbidden by rule 4).
In an early scene, a cameraman can be seen reflected in a bedroom mirror (director Thomas Vinterberg noticed this but kept it in).
All children "disappear" just before the dinner.
As the guests dance through the house, a boom mic can clearly be seen in the bottom left corner of the screen as they enter one of the rooms.