Glitch One: I dont think this has been posted before, ive looked. I havent even seen a video for it so im pretty sure me and my friend are the ones to find this. No video yet, workin on it though.

Also, GFXWoody. Give credit where its due mate, I found this first, you didint "Accidentally find it" While messin around.

Step one: start a Game and buy the m14 off the wall. Then Look at the wall with the four clocks
Two: As you look, the window on the right is the one to glitch on.
Three: Break the bottom left and right corners on the wall. (Knife once, shoot once or shoot twice idc)
Four: Repair the barrier
There should now be two boards on the window.
Five: Go to the left side of the window and try to jump up on the first board. Then the second, and then onto the top of the window.
Six: Now look to the table. You can sprint jump, or jump and then sprint but you have to make it to the table.
Seven: On that table, you will be hit, so You must sprint-jump onto the other table and you will be safe.

Tip: Zombies will start to die after about 5 min of doing nothing, so if you're out of ammo, just wait. And also, if you see a powerup, you can lay down, and crawl to the edge and you will pick it up.

This may sound hard but It really isnt.

Glitch 2: May have been posted before but Me and a friend were like woah! Haha
When the elevator is on a floor where you can cal it back and a friend needs to go in it, you can have him get in it and then you can call it back so neither of you will have to pay.

Edit: Someone has said that number 2 is not a glitch. Now, think about treyarch and IW, Do you think they would ever put something like this into the game. I sure dont think so. Now they might have, dont get me wrong, but I highly doubt it. Even if its only 250 points your saving, that could mean something sooner or later.

I have the video up now. Rate, comment please!
Hope these help Happy Glitching!

My gamertag is Deathsbugsy, add me if you need help or want to play.