Core Keeper 1.2 Update is out. Besides the "Mad Hat," are there anymore easter eggs out there?

Dakon from Dakon's Mad House did a stream the day before release. I caught some of it and he mentioned his hat was in the game and how to find it >!{Start a new world and change the seed name to Dakon, if you are interested.}!<

Are there others like his? If so how/where can you find them? Thanks: