Sanctuary Easter Egg - Halo 2 Reference in Sanctuary

In the second season, episode 9, about 20 minutes and 18 seconds in, Amanda Tapping's character is making a phone call. On the wall, to the left of her character there are drawings of weapons from Bungie's Halo franchise, specifically a M6 handgun and a MA5 assault rifle. These pictures appear to be diagrams for the weapons to be used in the show. I think it is a nod to the Halo 2 multiplayer level Sanctuary that shares the name of the show.