Continuity mistake: When Oliver shoots Ted with an arrow, Ted falls down on the ground. The position of the arrow keeps changing from being perfectly in the center of the chest, to a few inches off-center, depending on the angle.
Continuity mistake: In the scene in the garden where Oliver and his sister stand by the headstones, Robert Queen's birth date is carved into the stone as 1958. This conflicts with the news report at the beginning of episode 1 when his birth date is shown as 1948.
Continuity mistake: In the flashback to when Oliver brings a pizza in and puts it on the bed, the box goes from open in one shot to closed in the next. (00:28:30)
Continuity mistake: During the hallway gauntlet, Oliver takes a guy out and ends up on his left knee. He then starts to turn right and draws an arrow, which doesn't make any sense because he holds his bow with his left hand and can't get a good shot from that position. What's more, in the following shot, he is turning to his left.
The Odyssey - S1-E14
Continuity mistake: When Wilson jams the pistol in Oliver's face, Wilson is holding the gun in his right hand. When the shot changes, it flips - he is suddenly holding it in his left hand, and his previous un-scarred left eye now has some scrapes around it.
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.
Continuity mistake: When Oliver stabs the assassin with the poker, he pushes the thing all the way through, with the handle against the shoulder. In the next shot, there is a 3 inch piece of poker between the shoulder and the handle. (00:35:05)
Continuity mistake: When Oliver manages to wreck the Dodger's car, he skids his bike sideways and gets off. In the next shot, when the bike is in the background, he is no longer beside it, only to reappear in the next shot.
Continuity mistake: When Oliver drinks his tequila, the hand with which he holds the glass keeps changing.
Continuity mistake: Yao Fei takes the bow away from Oliver in one shot, then Oliver hands it to him in a following scene. (00:02:10)