To help Ryan Gosling stay in character, the real doll was treated like an actual person, as is done by the characters in the movie. She was dressed privately in her own trailer and was only present for scenes that she was in.
The real doll had 9 different faces which were used to show a sort of evolution of the character. The doll starts with a face with heavy make-up, but then later uses a more natural looking face without make-up. Finally, the doll's face becomes slightly green to reflect her "failing health".
At the first dinner with Lars and Bianca, the glass of milk Lars is drinking suddenly appears on the opposite side of his plate when he begins cutting Bianca's food.
The version of the Talking Heads song "This Must Be The Place (Naive Melody)" played at the party was never released on vinyl. The version played in the film is a live version recorded for the Stop Making Sense album but only appears on a Special Edition CD released many years later.