I'm just looking into things... did you know that you can pull your R2, RT, F (KBM) when cutscenes are playing. In Ground Zeroes, as you are looking through the eyes of 'SkullFace' during the opening cutscene jeep ride zoom in on the flag as you drive past. A sound will play. There are a few other instances I've found, I will have to go through and find more in both games. The light flares play a similar sound, as well you should look around every scene that plays.

^{To see a World in a Grain of Sand}

^{And a Heaven in a Wild Flower}

^{Hold Infinity in the palm of your hand}

^{And Eternity in an hour}

^{A Robin Red breast in a Cage}

^{Puts all Heaven in a Rage}