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Alert: may have some spoilers in the text bellow.

Firstly, sorry my bad english. Hope I can be intelligible.

(1) In Dracula's castle, more specifically in the room with the bed, there is a chest containing the frame (of the father of Dracula - or the own Dracula, idk - holding three cards with symbols of the zodiac) and a kind of crystal within a book. This crystal has to be put in place of one plate on one of the bookcases of the library. However, before I get this crystal, I managed to trigger the puzzle on the bookcase (as if I had already obtained the item). Unfortunately I can not tell exactly what I've done may have triggered this bug. Just know that, once I entered into the castle, I went right to the room, I grabbed the "wooden" ball (the one which the witch turns into crystal ball) and leave the room without opening the chest.

(2) Once I get the talisman and skipped the three charming demons, right when i click on the stairs to go up, in direction of the witch to give her the item, at the event of click on stais, automatically the cutscene of the talk with the witch begins. I'm suposed it was a bug because the cutscene happens on 95% of the screen. A strip at bottom of screen remains showing the gameplay scene.

None of these bugs was fatal, and I could finish the game with no bigger problems.
I also had the bug with the crystal/bookcase. Like you, it did not prevent me from completing the game.