Julian Albert (Tom Felton) is excited by the prospect of Earth Two being "Planet of the Apes." Felton previously played Dodge Landon in Rise of the Planet of the Apes (2011).
Grodd's plan to overthrow Solovar and rule Gorilla City in his place is taken from "Grodd of War", one of the comics in the "Flashpoint" series.
Julian tells Captain Singh that he and Barry are at a conference in Blüdhaven. Blüdhaven is the DC Comics city where Dick Grayson/Nightwing resides.
Towards the end of the episode, Cisco refers to Gorilla City as a "madhouse." This is a reference to the original Planet of the Apes.
Early on, when Barry tells Iris "Everything I do, I do for you", the first chord of the Bryan Adams song by that same name is heard in the score.