While in the US government bunker, the apes come upon a doll that goes "Mama" in the same voice the doll that Taylor found in the 1968 film which increases the realization that humans once were the dominant species of Earth.
Raka calls Mae Nova, stating that apes name all humans Nova. Nova was the name of the mute human adopted by Maurice in War for the Planet of the Apes. Nova is also the name of Taylor's human mate in the original 1968 Planet of the Apes.
Noa has the same birthmark on his chest that Caesar had in the previous three films