The magnetic letters on the refrigerator spell 'Enzo', the name of Arquette's son.
In the opening scene we see Lynn DiNovi (Tina DiJoseph) chatting at the Xerox machine with Devalos' assistant Sondra (Kendahl King). The camera pans away to show the rest of the room, but when it pans back and the shooter starts shooting people, we can see that DiNovi's back is to the camera and she takes a serious fall when she gets shot. It's pretty obvious that when the camera panned away, DiJoseph was replaced with a stunt woman.