Corrected entry: Throughout the movie there are visible microphones at the top of the screen. It's very visible in the scene in the beginning when Karin and Gus are in bed.
Corrected entry: 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.
Correction: About 8 seconds pass between the shots, time enough to move the glass. When the cutting shot begins, the milk in the glass is moving before he starts cutting, suggesting he did just move it.
Correction: There are no visible microphones in any scene that I saw. There are also none on the widescreen DVD version. If the submitter viewed this in the theater, it's possible that it's the fault of the theater projectionist, not the movie.