Visible crew/equipment: During the scene where Nick and Sam come upon Richard having a midnight snack in the kitchen you can see a small bright whitish reflection of some kind of equipment in the top left (our left) kitchen window, down in the lower right corner. There is no character movement or other scene related explanation for this reflection. It moves and fades during the scene, most dramatically at the end of the scene.
Continuity mistake: While Nick and Harold are jogging and discussing the possible buy out of Harold's business they are completely surrounded by fog. For 18 seconds they discuss this further in close-up. When they return to wide shot the fog is completely cleared up around them and is only visible in the distance now.
Continuity mistake: As Harold and Sarah approach the stairs outside their home, after saying goodbye to a funeral guest, Nick is sitting on the edge of the stairs and says "Hi" to them. Harold has his arm around Sarah's waist from the rear camera angle, as it cuts to a front angle his arm is on her shoulder.
Visible crew/equipment: Early morning jogging scene with Kevin Kline and William Hurt. As they are walking towards the camera on Hurt's left side, our right (the side closest to Klein). Level with Hurt's waist the wiring to his power pack working his mic is visible. Confirmed in DVD extras.