After clearing the game and finishing the credits, the following options are available if you collected specific items during your battle field session:
Character illustrations ... Possess Hand mirror of Utsmi from BF18
Sound mode ... Possess old music box from BF28
Item picture book ... Possess item book from BF39
Yggdra game records ... Possess Lithography of Mesara from BF44
Card illustrations ... Possess Revelations of Pantheon from BF47