Continuity mistake: In season one, Sara is a brunette in Oliver's flashbacks. In this season's flashbacks, she's a blonde (most noticeably the ones aboard the Queen's Gambit).
The Man Under the Hood - S2-E19
Continuity mistake: In the first shot of Thea running out of Slade's car, she closes the door. In the second shot, you can see the door of the car open. (00:02:05)
Continuity mistake: When Bronze Tiger is stealing the prototype earthquake device, when the truck is leaving Merlin's garage, the street shown has street lights and a factory building, not a country estate driveway. (00:17:10)
Continuity mistake: When Oliver tries on his mask for the first time, he is not wearing eye make-up. When the mask is on in the next shot, he suddenly is.
