When Green Arrow is inside City Hall he passes a sign that says "Starling City". Starling City was renamed into Star City prior to this episode.
It is said that the Rubicon has given Damian Darkh control over America's NATO allies' nuclear weapons.The nuke that Felicity cannot control in the end is a Russian weapon; Russia is not a member of NATO.
The knife that Reiter pulls from his chest changes from bloody to fully clean between shots.
During the fight in the forest, when Diggle is fighting one of the Ghosts. You can see the air launcher used to help flip the stuntman into the air. There is a burst of compressed air from a tube that is seen.