Continuity mistake: Cato's body moves to a different spot on the floor relative to the unconscious Avon, who also moves. (The two are suddenly much farther apart than before.) Cato's hands also change positions.
It's not every day you can shoot your wife in front of millions of witnesses and get away with it. Klyn, the woman behind the console who sounds the alarm before Avon shoots her, was played by Paul Darrow's real-life wife, Janet Lees Price.