Glitch no.1 In the level The Ark get to the part where there is a cutscene and then you and the Arbiter are on seperate ends and there is a phantom attacking you. YOU MUST HAVE A FUEL ROD OR A ROCKET LAUNCHER FOR THIS TO WORK. Now when the Arbiter is about to hijack the brute banshee keep shooting it with fuel rods until it blows up and if done correctly the arbiter should be in the banshee and it will be destroyed on the floor. Now you can hit it and play around with it while the Bot-Arbiter thinks he his flying away!
Glitch no.2 Well this one is more of an Easter Egg. On the first level when you are at the part with all the jackal snipers in a valley stay to the right and go up onto the ledge until it stops and there is just a wall of stone. Then go around it on the right and when you are on another ledge look in the corner and there should be a family of monkeys that you can shoot and they dont die and one of them is holding a teddy bear.