Well, Alone in the Dark had quite a few references.

There are Nightghaunst in the stairs, even thought they aren't like the ones in the Lovecraft stories, in them they where creatures with darkness instead of faces and daemonic look that were servitors of the hidden ancient gods that trapped the old ones. There, they look like daemonic statues and are killed with they reflect in a mirror, but even thought, the look is exactly the same as in one somewhat known ilustration of them, that appeared in the pen and paper role playing book and the card game.

Also, the thing in the library is said to be a dimensional vagabond (at least as something like that was referred in spanish), a thing that appears in a story that I haven't read.

In the library, in the hidden room, there was a book that appears in a Robert Bloch storie dedicated to Lovecraft. As in the storie, if you read the book something invisible appears, raises you in the air and breaks your back (and supposesly drinks your blood).

In the underground you can find deep ones, and also there was some information about them; Mi-Gos, also based in a know drawing; and a dhole, that was named in some papers.

To protect yourself of the wizard at the end you had to use an stone with the elder sign engraved.

Also I think there was a reference to Yog-Shototh, an elder one. And when you died I think there was an image of some creatures from the Cthulhu mythos.

Just to add. The game is part of a trilogy formed by Alone in the Dark, The Shadow of the Comet and this, The Prisoner of Ice. There are references to the previous, as the explorer that is named in the three and whose ghost appears in this one, or the main character of the Shadow of the comet that reappears.

Also, the have some direct references to the Cthulhu Mythos, the cycle of stories created by Lovecraft and friends. In this one, for example, there is a direct reference and image of Cthulhu.

Feel free to share anything about Prisoner of Ice (1995) here!