Halo 2 Glitches and Secrets

What is an easter egg you ask. Well like easter eggs they're hidden. They're basically little glitches, secrets, or shoutouts in the game. They're ment to be found.

FACE ON CONTAINMENT: Get a scoped gun and look up at the halo. Look at the white icy part and make your way to where it ends. Up to where it ends there is a face of someone. It's one of the programmer's face, Chris I believe is his name. It can be seen on both sides.

ROOSTERTEETH: On Turf by the medtent, you'll notice a vending machine with rooster teeth on it. Well it's subtle but the makers of Red Vs. Blue are RoosterTeeth Productions. Bungie just made a shoutout to them on one of the vending machines! 

SECRET MESSAGES: There are 2 secret messages, one on Coagulation and one on Beaver Creek. On Coag. it's in the cave and it's on the wall that's by the opening  to the dropdown to the lower level. The one on Beaver is up at sniper spawn. It's on the small ledge with the rocks. One message is 'Not Sid Was Here' and the other is 'Why Am I Here?'.

WATER WALL: This is one that I actually found myself! First off make sure you have the sputnik skull and a bunch of grenades. Start on outskirts. Go to the beach and go past the big tower thing in the sand/water. When you come to the 2 pipes in the sand turn left. You'll see a little inlet and 2 pipes coming down from the wall and a small slant up the wall. Grenade jump onto the flat landing, then grenade jump against the wall in front of you. You'll be on a large flat area where the pipes stop. Then turn right and walk towards the seawall. Get on it and turn right. Follow the railing on your right and walk towards the end of the seawall. Go as far as you can go and turn left. Get in a corner and grenade jump. When your on the next landing turn to the right and grenade jump up. Then walk to the left and forward and jump down. You'll see a wall of weird picture things. It looks to me like hidden artwork. Also when you shoot it or chuck a grenade at it, it's like your shooting water!!! It's really cool.