Hey there. The scene in the shower block is hidden behind a puzzle in the northwest area, you can inspect the graffiti on the north wall to get you started. As for the Beagle part in the lab, I'm not sure what you mean, since Beagle doesn't have his own scene in the lab.
i cant see the scene of the large black goppy potion i can acces the room (where is the potin i can acces behind the shop)and i alredy in previous vercions