Revealing mistake: When Gary Oldman is following Kate Beckinsale to the kitchen after first arriving at her home, you can see his lower legs dragging along the floor through the glass coffee table as he shuffles on his knees.
Revealing mistake: The first night Ben brings Andie home, he starts the music on the CD player, but no CDs are spinning at all. Yet, the music still plays. He also changes the track mid-scene, and still no CD is spinning.
Revealing mistake: One of the accountants' computers has no power cord attached to it.