Corrected entry: Connor's stake cannon has 3 barrels, all of which are assumed to be loaded, when he arrives. During the episode teaser, he fires one stake from each of the three barrels. After the credits, he fires two more stakes from the top barrel and one from the right. Of course, he hasn't stopped to reload and it's obvious that there is no room in the simple device for more than a single projectile and the launching mechanism.
Corrected entry: Holtz has Justine kill him by puncturing his neck to make it look as if Angel bit him. When Connor finds them, there is very little blood coming from the wound, which WOULD be the case if Angel had bit him because a vampire DRINKS the blood, so what did Justine do with it all?