Re-watching SSSS.GRIDMAN since Gridman Universe is out now and I can't see it due to not living in Japan
and Trigger/Tsuburaya/Toho/Whoever's in charge of international distribution are being real cool rn and not giving any word in regards to an overseas release, and this series is already pretty chock full of references to past Trigger and Gainax works, especially to Evangelion (you can kinda tell Amemiya was very heavily inspired by Anno). However one I didn't notice before was this one:
Which admittedly seems like a pretty inconsequential one at first, merely reusing the number for Rei's apartment for Yuta's (the main character of Gridman) as a cute small shout out to Eva. The reason I say 'at first' though is because the reference does somewhat take on a bit more depth when combined with the details that Yuta has amnesia, is
technically an artificially created human (although to be fair, so is almost everyone else in his world), and the revelation that he's
the vessel/other half of the soul of a powerful otherworldly being (albeit one that's a lot less mysterious and more overtly heroic).
Also adds an possible extra layer to the fact that Yuta looks like this ->

Swap the eye and hair color around and whose character design does it now remind you of? Which to be clear, I don't think Yuta's character design originated as an inverse of Rei's, I know it owes much more to Cliffjumper from Transformers, but it does make for an interesting parallel knowing all that other stuff I just mentioned.