Stuck in Doorway: This glitch is known to work on the final stage of the Skyfall mission. It is not known if this works with other doorways in other missions. If you are sprinting when you open the door and immediately drag your view downward it will stop you and you will be stuck in the doorway until your sprint runs out. Here is a video showing it in action: http://www.youtube.com/watch?v=7LzlD-233n0
Get through barricade on Blofield Infiltration challenge: This glitch works on the Blofield Bond challenge mission. You are not supposed to be able to pass through the barricade, but if you crouch and push your way through you can get through the barricade. Here is a video showing it in action: http://www.youtube.com/watch?v=b8lBoI8sIjc
Ceremonial Plaza roof glitch: This glitch gives you the ability to get onto the roof of the structure in the center of the Ceremonial Plaza map. It is known to work on Challenge mode, as well as online Multiplayer. Demo video: http://youtu.be/Wmj0QGUcJU4
Challenge mode leaderboard glitch:
If you spend too long on a challenge, you will be logged out of the Nintendo Network. It won't tell you this, so you should probably back into the main menu and enter the challenge menu again every once in a while if you're aiming for a high score. If you get a new high score while not logged into the Nintendo Network, it won't be recorded on the leaderboard, and you won't be able to get onto the leaderboard until you beat that score while connected to the Nintendo Network.
Get Stuck in Statue on Refinery Campaign Stage: There is a statue near the start of the level that you can get stuck in. See the video for a better description of its location and how to get stuck. Video of glitch: http://www.youtube.com/watch?v=UyxZzXmVyag
Ghost Bond Glitch: This glitch allows you to get stuck in a booth at a table and float like a ghost. If you die, you don't really die right away, which adds to the ghost effect. Video of glitch: https://www.youtube.com/watch?v=zPUASX8E08s
Online Multiplayer Level Glitch This glitch has a few ways it might occur. If the lobby is completely full and someone is trying to join, then sometimes it will change a few players levels back to level 1. Sometimes a specific player will always cause the glitch to happen when both of you are online. The only thing you can do at that point is to go offline and try back later hoping that the other player is no longer online. If this glitch does happen to you, then you should leave the lobby immediately to prevent losing your current level. If you notice the glitch at the final scoreboard, then press and hold the power button on your console until the power is off. When you log back online your level should be normal. If you are host and you see the level glitch in your lobby, then you should end the lobby before the game ends to save the other players that may not have noticed. If you managed to be hit with the level glitch and did not notice before the game returned to the lobby, then you will have to hope your level returns to normal after a few games. It usually does return to normal, but there is no guarantee.