There were a couple little references and easter eggs throughout it that I really haven't seen people talk about so I'm gonna do that!
Spoilers (not anything huge, but still be warned)
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First thing I noticed is that Kong's little cave entrance on the side of a mountain is almost exactly the same as his cave entrance in the original King Kong (the place he brings Anne Darrow to and fights off a pterodactyl at).
Both Godzilla and Kong use their original roars from time to time, not fully screaming them but occasionally Godzilla or Kong will growl them for a split second.
Bernie's room has the Muto movie poster that Ford Brody had in his room at the beginning of Godzilla 2014
Holy shit Skeleturtle. He doesn't physically show up but he's spray painted onto a wall that Godzilla steps on alongside graffiti of Hedorah, Jet Jaguar, a Xillian UFO, and Knifehead from Pacific Rim
There's a fuzzy little glowing dragonfly that flies around Mothra's temple, and my first immediate thought was "omg fairy Mothra" I actually don't know if that was on purpose, but it has the same color pallet as Mothra along with it being furry and bioluminescent so it's probably related to her in some capacity right? (I'm coping)
Not even kidding there's an actual Skeleturtle Easteregg in the movie
Everyone's saying "oh it's Biollante" or "it's Destroyah" for the new big bad in the next Monsterverse movie, but they could totally just pull a Skull Island and make a super obscure monster the main antagonist
This is why I vote Skeleturtle to be the next kaiju
A visual explanation of why stars fall on Earth. Details of The Augsburg Book of Miracles, an illuminated manuscript made in Augsburg in Germany in the 16th century, anonymous author-ess.