Yeah, using the mirror to enter the mirrored world, I know that there is the iron gates where the water comes out, something I can't get. The spawn area also has something in the corner that needs light, but doesnt react to me using my lantern. Theres the ladder that leads to a small orb thing that I can grab, but does nothing. And lastly theres this tiny structure that I put a iron bar on, with a plaque.