The Arrow shoots Jason Brodeur in his left hand, pinning it against a wall. But when Brodeur is later shown being led away in handcuffs, he has a bandage on his right hand.
When the train approaches the signal light on the track turns green in the direction of the oncoming train. The signal should be red in indicating the track is not clear in that direction.
Carly refers to John Diggle as "Dig." Considering that Carly was married to John's brother Andy Diggle, and therefore shares his last name, it is not likely that she would refer to John by his (their mutual) last name.