Bonus Feature:
On the "Special Features" menu, there is an item for "Secrets of the Antonia Graza". When you click it, you are told that there are 4 secret stories.

The first "E" in "Welcome", "M", or the "O" in "Aboard" will all take you to different secrets.

For the fourth scene, the story of Katie, you have to select the "R". This will take you to a different message where you need to select the "N" in "Danger".