When Sark sees Lauren's bullet-riddled body, he seems surprised when he figures out Vaughn was responsible. But in the previous episode "Echoes," he says, "Was it the infidelity or the espionage that motivated you to kill the woman I loved?" So if he knew then that Vaughn killed Lauren, why is he surprised here?
Anna digs an explosive device out of Sark's neck. In a scene set 14 hours later there is no sign of the wound.
Sark pulls the zipper on Lauren's body bag down past her chest to see the bullet holes. When Vaughn looks at Lauren the zipper is mid way down her neck.