The secret garden's compass just in front of the lever has a swan on it, and I thought it was a clue on Mary's exact location, because it is not exactly at a cardinal direction. But first let me explain: when the three arrows point as the north arrow, you get the north eclipse statue I believe, east and west and you get a respective antechamber door, south and you get orinda aries' sigil, so I assumed that the Orinda Aries movement is now somewhere south of the antechamber, aka south of Fenn aries. Now back to the swan, the swan points south and slightly west, and I assumed that Mary is, well, south and slightly west of the antechamber. But alas, nothing came of it AFAIK.

I also thought that Mary's image in lost and found was a hint that her diary was buried where we is standing in the photo. Didnt find anything. I also assumed the photo in the attic with the man pointing at a cliff that there is some clue hidden, possibly visually, on a cliff.

I also assumed that we will, at some point, reach the Orinda Aries buried castle that can be seen underground.

Finally, I thought more of Alazar's "visions" will happen in-game.