During two scenes in the doctor's lab that were scripted as occurring at night, light coming through the blinds and shadows in the room show that they were shot during the daytime.
One character supposedly wrote an initial on the floor with his blood as he was dying to identify who did him in. Not possible. He was killed from behind without any words spoken and no chance to see who killed him.
Roger is wrong when he says that, in reality, all of Madame Colette's girls were Eleanora to Waldemar. In reality they were not, but in his mind they were.