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.
Trivia: When Zari says she'll agree if the team helps break her brother out of A.R.G.U.S., Rory replies "Prison break. I'm in" Dominic Purcell and Wentworth Miller (who play Rory and Snart) both stared in the TV show "Prison Break."
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.
Trivia: Victor Garber says "I refuse to set foot on the Titanic. Whoever built that ship should be shot." In Titanic (1998) he played Thomas Andrews, the designer of the ship. This episode also stars Billy Zane, who played Cal Hockley in Titanic.
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".
Trivia: When Rip Hunter gets knocked over the edge of the building, he reappears standing on the Waverider (the time machine) as it rises up, with his arms crossed. He does so in the same manner as Marty McFly did in Back to the Future 2 when he reappears standing on the DeLorean (the time machine). They even used part of the Back to the Future theme music for the scene.
The Magnificent Eight - S1-E11
Trivia: In the town of Salvation there's a place called "Kubert's Barber Shop." Joseph Kubert was a comic book artist for DC Comics and creator of Hawkman/Carter Hall.
Left Behind - S1-E9
Trivia: Not quite a mistake given the fictitious nature of the show; but in 1960, as a college physics professor, Ray makes a comment indicating one of the guys in his class is Bill Gates' father. Bill Gates' proper name is William Henry Gates III, and the man in class would be William Henry Gates II (or William Gates Jr.), which should have been enough of a clue for Ray who this man was. However, Bill Gates' father graduated from law school in 1950 and would have been 35 in 1960, not some young college kid taking a physics class as shown.
Left Behind - S1-E9
Trivia: After being stranded in 1958, Sara, Kendra, and Ray go to Hub City. Hub City is home to the DC comics character, The Question.
Trivia: One of the plots of this episode is the Legends encountering zombies. When Constantine and Zari are at Joe's scrap yard, they come across a truck labelled "Pilato's Fish and Chips." Joseph "Joe" Pilato was best known for his role in the zombie film "Day of the Dead." He also appeared in "Dawn of the Dead" and "Night of the Living Dead: Darkest Dawn."
Trivia: After the Legends escape the military vehicle and try to flag down a passing car, the old lady in the passenger seat says "Don't stop, Wilbur!" There is a very similar line from "Back to the Future" when Marty is trying to flag down a passing car and an old lady in the passenger seat says "Don't stop, Wilbert!"
Hey, World! - S4-E16
Trivia: At the end, the names of the "sinners" on the soul coins seen are Joseph Stalin, Caligula, John Wayne Gacy. Charles Manson, Mary Tudor, Grigori Rasputin, and Lizzie Borden. Lizzie Borden incidentally was acquitted of murdering her father and step-mother.
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."
The Magnificent Eight - S1-E11
Trivia: During the bar fight sequence, the "Wilhelm scream" can be heard.
Trivia: Oliver Queen is shown exactly like was in "The Dark Knight Returns" cartoon film, old and with only one arm.