Everything the film says about the Dewey Decimal System is wrong. The History of Virginia Ham is given the Dewey Decimal number F 227.M36 2006. If this were a Dewey Decimal number, this would be Biblical epistles. This is, in fact, the Library of Congress catalog number for Historic Houses of Virginia: Great Plantation Houses, Mansions, and Country Places by Kathryn Masson and Steven Brooke (which is the actual name of the book used). When Bridd and Charlotte go to seek out the Dewey Decimal number on the book's spine, one can clearly see the names of authors of fiction, including Robin Cook and Clive Cussler, in what they correctly determine to be where the item they are looking for has been hidden. Books about food and meals have Dewey Decimal classification 641 and 642.
At 46:25, when Charlotte calls Bridd "smarty pants" and holds up the two grids of numbers, you can clearly see he accidentally swapped 22 and 15 in the seventh row.