During the trivia competition, Felicity and Barry identify portrait #3 as that of "Erdel". The portrait is clearly that of Nikola Tesla.
In the museum, the tour guide says the transcontinental railroad passed through Central City in 1852. The transcontinental railroad wasn't built until the 1860s.
The two couples meet for Trivia Night, but it is still clearly afternoon outside of CC Jitters.
When Dr. Wells, Cisco, and Caitlin discover the weapon has been stolen, the door has a typo in the label as "Restriced Access"
When Leonard Snart's accomplice wants "out," he is shot by Leonard. The gunshot sound is from a gun with a silencer; however, the gun is shown without a silencer attached.
If Felicity and Cisco can hack into the cold gun, why couldn't they just disable it?
Barry says that e=mc2 is Einstein's formula for kinetic energy. This is incorrect. It is the formula for mass energy equivalence.