At the 'Main' menu select the 'Extras' option and load a previously saved game file. Then select the 'Game Secrets' option followed by 'Enter Code'. The following symbols are entered in the Alethiometer in the order, top left, bottom left, and top right. If entered correctly the corresponding featurette will become available at the 'Featurettes' option at the 'Extras' menu and the game will save automatically.
Unlock 'Audio Session: Dakota Blue Richards' Featurette: Enter Compass, Sun, Madonna as a code.
Unlock 'Audio Session: Freddie Highmore' Featurette: Enter Compass, Moon, Wild Man as a code.
Unlock 'Behind the Scenes...' Featurette: Enter Alpha/Omega, Alpha/Omega, Compass as a code.
Unlock 'Daemon Motion Reference Shoot' Featurette: Enter Griffin, Elephant, Owl as a code.
Unlock 'Polar Bears in Motion' Featurette: Enter Sun, Moon, Wild Man as a code.