Complete the game after having obtained three G Reports and you'll get a small extra ending after "The End".
2/6/2006
Event Viewer
Complete the game and save. Now load this Clear Game data and you can choose to see the cut scenes. The more Memory Capsules you collected during game play, the more scenes you can see.
To unlock Side Missions in the extra feature, you must locate and destroy the White Capsules in the individual Extra Missions using an explosion from an explosive barrel nearby to destroy it. Each one will unlock a Side Mission that will be listed below the Extra Mission where you destroyed it. In the Side Missions, there are no memory capsules to destroy.
White Capsule in Mission 45: Stronghold Impervious, H-8
Boxemon
White Capsule in Mission 5: Deep Labyrinth, K-15
8/21/2006
Unlocking Sound Gallery
To unlock sound gallery in the extra feature, you must locate and destroy the Green Capsules in the individual Extra Missions using a materia shot to destroy it. Each one will unlock a different sound clip.
Green Capsule in Mission 22: Shinra Manor Prime, H-5
Bosses
Green Capsule in Mission 29: Trick Arc, L-7
Vincent
Green Capsule in Mission 34: Sprial, D-5
Tsviets
Green Capsule in Mission 39: Brotherly Love, G-3
Battlefields
Green Capsule in Mission 4: Vincent the Mage, C-12
Omega
Green Capsule in Mission 42: Two-Handed, K-6
Events
Green Capsule in Mission 7: Gatling in the Wastes, F-9
8/21/2006
Unlocking Art Gallery
To unlock the Art Gallery in the extra feature, you must locate and destroy the Red Capsules in the individual Extra Missions using a melee attack to destroy it. Each one will unlock a different art portraits.
To unlock character viewer and trailers in the extra feature, you must locate and destroy the Yellow Capsules in the individual Extra Missions using a gunshot to destroy it. Each one will unlock something different.