Swan Thong - S5-E15
Continuity mistake: During the fight scene near the end when Marie Antoinette tries to stab Mick he grabs her wrist, it keeps changing which wrist he is holding. When it shows from her point of view looking down he has her right, but from his point of view looking up he is holding her left.
Out of Time - S2-E1
Other mistake: Sara tells Jefferson that the professor has a one hell of a right hook (referring to Martin knocking Einstein out). Jefferson replies, "seriously, Gray punched him out?" The subtitles mistakenly say "Ray."
Jefferson 'Jax' Jackson: Is there anything you think about other than yourself?
Leonard Snart: Yes. Money.
Trivia: Nate's dad, played by Thomas F. Wilson, says "let's make like a tree and leave", to which Nate replies "I'm not sure that's how it goes." Thomas F. Wilson famously played Biff in the Back to the Future films, who frequently got that saying wrong.
Chosen answer: Black Canary, Spartan, Wild Dog, and Ragman.