Continuity mistake: When the kid & babysitter go down to the basement, she enters the stairs first. The shot changes, and now the boy is in front of her. (00:46:00)
Visible crew/equipment: James Marsden and Cameron Diaz are getting ready to go to bed. They have a short conversation about turning off the Christmas tree lights. As Marsden is bending over to turn the lights out, there is a window behind him. As soon as the lights go out, you see a head start to pop up in the window. You only see the forehead of the person, then the scene changes quickly.
Factual error: The briefcase containing $1 million was full of $100 bill straps, two columns by six straps or $120k per layer. Eight layers would have been 4 inches tall, not including the four straps left over. The top and bottom portions of the case were equal depth and only the bottom half was full. The case would have had to be approximately 8 inches deep, which it evidently was not, to hold $1 million.