Barry suggests using the meta-human cure on Cicada, and Caitlin and Cisco act as if they're only hearing of this idea for the first time. Also, Barry acts as if he only just came up with it, even though he'd previously mentioned to them that he wanted to use the cure on Cicada.
Central City is supposed to be a fictional American city, but on the boat dock, a Canadian flag is visible in the background.
In the opening sequence, Flash and XS are paralyzed, and Flash says "I can't move!" but then both he and XS turn their heads to watch the battle between Grodd and King Shark.