Deliberate mistake: Whenever Deathstroke is on screen, he has three grenades for a launcher strapped to his chest. But on closer inspection, you can see these grenades are actually BB-gun grenades: You can tell by the very distinctive holes at the tip. They did this because launched grenades are A) very expensive and B) not very safe to walk around with on set. A few of the most noticeable times are when Yao Fei is fighting him when he is freeing Oliver in episode 5 and when Oliver is talking to him in episode 14.
Arrow (2012)
1 deliberate mistake in season 1 - chronological order
Starring: Katie Cassidy, David Ramsey, Stephen Amell, Colin Donnell, Emily Bett Rickards
Darkness on the Edge of Town - S1-E22
Character mistake: At one point Felicity says, "There's at least a teraflop of data to go through." Felicity is a computer genius, so she should know that a teraflop is a measurement of processing power, not data storage. She should have said "terabyte."
Lone Gunmen - S1-E3
Oliver Queen: I'm having some trouble with my computer and they told me you were the person to come and see. I was at my coffeeshop surfing the web and I spilt a latte on it.
Felicity Smoak: Really?
Oliver Queen: Yeah.
Felicity Smoak: Because these look like bulletholes.
Oliver Queen: My coffeeshop is in a bad neighbourhood.
Trivia: When Barry and Oliver are fighting on the street, a police officer asks for backup and mentions Burton and Nolan street, as reference to Christopher Nolan and Tim Burton.
More questions & answers from Arrow
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Chosen answer: "C'mon Doll" by My Goodness.
Bishop73