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."
Legends of Tomorrow (2016)
1 other mistake in season 2 - chronological order
Left Behind - S1-E9
Factual error: Ray, Sara, and Kendra are Left Behind in 1958. However, 10 weeks later Sara and Kendra are playing the board game "The Game of Life." The modern version, as seen, didn't come out until 1960 (previously it was called The Checkered Game of Life and doesn't resemble the modern version).
Jefferson 'Jax' Jackson: Is there anything you think about other than yourself?
Leonard Snart: Yes. Money.
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.
Question: Why don't the heroes use at least 2018-era protective gear to keep from getting shot or stabbed?