Character mistake: After Ray Palmer says he's an Eagle Scout, he says to Leonard Snart, "be helpful to others, scout's motto." The Boy Scout's motto (including Eagle Scouts) is "Be Prepared." "To help others at all times" is part of the Scout's oath, but that's different than its motto and not something an Eagle Scout would mix up.
Factual error: At the beginning of the episode, when Snart steals the keycard from the female soldier in 1986, she is shown to be wearing the U.S. army's Combat Infantryman Badge, a combat award for infantry soldiers. It is not possible for a woman to have that award then, due to the fact that infantry was closed to women at the time.