When Francois and Philippe visit Andre's laboratory from the first film, the messages Andre wrote on the blackboard can still be seen. But at the end of the first film, Helene had told Inspector Charas she had rubbed them off the board to cover up Andre's experiment. See more
Here passes from this earth Helene Delambre, widow of my brother, Andre, whom I loved deeply, hopelessly. She was destroyed in the end by dreadful memories, a recollection of horrors that did not dim as the years went on, but instead grew monstrously, and left her mind shocked and unsteady, so that death, when it came, was a blessed release.