Raiders of the Lost Art - S2-E9
Trivia: George Lucas has on his license plate the letters THX, that's the sound system invented by him for theaters.
The Justice Society of America - S2-E2
Trivia: When Martin is pretending to be Max Lorenz, as he's about to start singing he tells the band "watch me for the changes and try to keep up", something Marty McFly tells the band in "Back to the Future".
Raiders of the Lost Art - S2-E9
Trivia: The Spear of Destiny is a plot point in the film Constantine; in a crossover with the 2014 Matt Ryan Constantine TV series, the John Constantine character appeared on Arrow - Legends' parent series - in the season four episode "Haunted."
