Visible crew/equipment: When Sam and Dean are talking to Bobby about to leave after exorcising Meg, in the bottom right corner of the screen a cameraman's arm and camera can be seen. (00:17:10)
Visible crew/equipment: While Sam Bobby and Dean are talking you can see in the bottom left-hand side a person sitting looking at a camera. (00:17:28)
Answer: Angel blades come from angels. It's their angelic magic that makes it special. Therefore, an archangel blade is made magical with the powers of an archangel. They couldn't have just created one or used one, as none of them are archangels.