The piece of paper Richard Heritage (James Mason) picks up from the floor reads CHILD'S THEATRICAL AGENCY.
Later as he is leaving their offices the sign on the wall reads CHILDS THEATRICAL AGENCY (no apostrophe).
Later as he is leaving their offices the sign on the wall reads CHILDS THEATRICAL AGENCY (no apostrophe).
When she was speaking to the Police, Laura said that the paper tore into 2 pieces and that a part of it was left in Mary's hand.
The piece of paper that was in the hand of Mary's body (Patricia Medina character) and Laura (Joyce Howard's character) took and put in her purse, later when they were going to bury Mary's body, the piece of paper is in her hand again.