Other mistake: During the scene where Tom Hanks brings Sophie to his colleague's house in England, there is a chess board. The chess board is incorrectly set up as any chess player will tell you that the white king belongs on the fifth square from the left. In the shot, the white king is one the fourth square from the left, ie. he is switched with where the queen should be. Teabing would definitely know how to set the board up properly.