At 1:04:12, Volkoff put a pin through the picture of Sonia he just clipped. Seven seconds later, as Alex watch him secretly through the door, he does exactly the same action with the pin.
When liquid starts pouring of stitches on Giorgina's back, it's seen in the close up, but in the shot where Sonia too is seen, it isn't.
When inspector crouches to pick up the hiding child, the cut hand on the floor was not covered, but when he is picking her up, it is.
When Sonia's father is shown for the second time at the start of the
movie, he can be seen breathing and moving.
Snouts used in the scene with pigs are obviously fake.
When Andrea examines the statue of a prostitute, her eyes move, even though fake eyes are supposed to be in front of her real eyes.
When burning Boris fights with Alex at the end of the movie, it's clearly
a doll to prevent hurt from fire.
Obviously a fake bug when it's killed with a pin.
If inspector left his key in the room, why would his impersonator get the key? The door would have been unlocked. Also, how could the inspector leave the key in the room if he was in the room? The doorman would know that he was in the room.