1) If you choose to blackmail Tortoise, or choose to open the safe box without the sonograph, you are not actually required to pick up the sonograph at the hospital morgue. Later in the game though, when getting the key from the locker, you can use the magnet on the locker and are able to move it, but you won't actually see where the key is. You can not return to the morgue at that point.
Is this puzzle actually programmed so that the key can be magnetted out of the locker blindly? Or is the possibility of solving it only triggers once both the sonograph and the magnet are applied? I've been trying to solve it without the sonograph for some time, but failed to do so, and I don't think I can hear the key falling to the bottom of the locker, or any other sound that can guide me.
2) One minor thing is that the empty pill bottle can be picked up from the floor, even if Ozzy hasn't dropped it yet. It's not drawn, but the item exists there, and once you click on it, the character picks it up. Later, when Ozzy drops his bottle, you can actually have two identical bottles in your inventory.
3) Another even more minor thing is that when staring through the bars of the vault door (where you need to get the fuse), the "Back" button is actually labeled "Release" (as in the previous room, where "release" meant to release the switches.)
Sorry if those are not bugs, I just thought I might be helpful if they are.