Data pearls (by default) can be spent at these vending machines to obtain beverages.
Miniature iterator can
Some blocks in Rain Rot have special interactions. For example, the Saint slug plush can be shift-right-clicked to extend its tongue.
Inv
While tunnels can be used as decorations, they're also functional. Crouch in front of one to begin crawling!
Slug plushies
Iterator plushies
Paintings
Known for recursively transforming slugcats, these blocks can now go in your base. When powered on (using redstone), they deal damage to anything that touches them.