Second and third panels are a bizarrely (heh) specific Jojo reference that seems to have been a very minor meme in Japan, probably due to the odd wording of the original. Eirin's joke is both a straight-forward bad pun and apparently an Android Kikaider reference.
I have a strong feeling this is going to end up somewhere between educational and absolutely unintelligible to anyone who doesn't put my amount of effort into researching it. (No, I don't know any of this off the top of my head.)
Updated
CHANGE!
ZERO! WA!
Zero = ReiWait, did you come here just to say that and show your red-blue self?It's Reiwa.New era...Now, she will say a few words as we head into this new era.Yeah, we know.And this is the Eientei officer Yagocolo!Oh, right. You're a "rei" too.
Bow, all of you!
Bow = ReiAren't you forgetting someone important?Whoa there...