When Casey tells Chuck that the Premier has AB negative blood, Chuck and Awesome start asking everyone in the room if they have AB negative blood. In that dire of a situation, it wouldn't be absolutely necessary for the Premier to receive AB negative blood, as long as the donor's RH factor was also negative. AB blood types can accept blood from anyone, as long as the RH factor doesn't interfere. (People with positive blood types can accept positive or negative blood, and people with negative blood types can only receive negative blood)
Chuck treating Casey's wound. Devon said the bullet might have nicked the femoral artery, but the bullet hit the outside of the thigh and the femoral artery is on the inside of the thigh. Chuck asks for tweezers and is handed rat tooth forceps. He asks for forceps and gets Hartman Ear Dressing Forceps.