Donate 100 silver to the priests in the towns and wild to unlock various bonuses, such as movies, artwork, and songs. Additionally, use the following trick to unlock the bonuses easier. After getting at least 2,000 silver, save the game. Find a priest and make a 100 silver donation. Keep donating 100 silver until all your silver is gone. Then, pause the game and select the "Exit To Main Menu" option without saving your game. Answer "Yes" when warned that your unsaved chapter progress will be lost. Once at the title screen, enter the "Extras" menu to view the unlocked bonuses. Exit that menu and load your previously saved game. Immediately save the game again. You will still have all your silver and the unlocked bonus options.
There is no easy way to get all the bonuses. You must do a set amount of large donations which are listed as follows. The number indicates the number of large donations that must be made with the corresponding bonus that you will get. Note: If you save and leave the game you must redo every donation to get up to the same amount as when you saved.