Continuity mistake: When Oliver takes the circuit board out of the missile launcher, Wilson grabs the radio to get out of there. But when he says "Leverage", the radio is back where it stood.
Other mistake: When the Huntress is attacking the safehouse, she fires a shotgun blast at Green Arrow who's several feet away, hitting a door behind him and leaving a small hole, as would be made by a slug, rather than pellets (which would have spread out a lot over that distance). She then shoots the door lock right next to her, which gets riddled with small pellet holes.