Character mistake: During the meeting between Langdon, Sophie and Sir Teabing, Teabing refers to Scatoma as "the mind seeing what it wants to see." Scatoma refers to a partial loss of vision. He probably meant to use Pareidolia, which refers to seeing patterns that are not really there.
Character mistake: When Michael is interviewing Bishop Aringarosa on the plane, he addresses him as 'Eminence'. A cardinal is 'Your Eminence', a bishop is 'Your Grace'.
Character mistake: Langdon points out that the Templars were slaughtered on October 13th, 1307, and Sophie comments, "Friday the 13th", implying that this is when the fear of Friday the 13th originated. In reality, fear of Friday the 13th didn't really begin until early in the 20th century.
Suggested correction: While many do believe that it's just a myth that the origins of Friday the 13th being considered unlucky are due to the Knights of Templar being arrested on a Friday the 13th, that's pretty much what the whole series is based on; origins of myths being real. Plus it should be noted that Friday the 13th being considered unlucky has been written about since the middle of the 19th century, so it did not begin in the early 20th century. However, the origins of the day being unlucky can be traced much further back. Chaucer wrote about Friday being unlucky in "The Canterbury Tales" (1387) and the myth of the number 13 being unlucky can be traced to much earlier origins (said to be unlucky because there were 13 at the Last Supper).
