The Flash Season 2: 28 Easter Eggs & References You Might've Missed
9. Holy Harry Potter
The CW shows went through a couple of big Harry Potter phases this month, with two different weeks seeing the wizarding world referenced across the DC shows.
The most direct reference is when Hartley says the line "Holy Harry Potter," but there are a couple beyond that. Another is the presence of the Time Wraiths, which Cisco compares to Dementors.
In a later episode, and probably the best example, Harry asks Cisco to get the wand, meaning the Weather Wizard's. Cisco, however, queries whether he means that one, or the one he made for a Harry Potter convention. Then once he actually has the wand, he points it towards the sky, gets struck by lightning, and yells "EXPECTO PATRONUM!"
Why all the Harry Potter references? Maybe someone working on the show is a fan, maybe Warner Bros. want as many reminders of a new HP-universe film out this year. Who knows!?