Other mistake: On Evan's missing poster that Wizard finds in the park, it states his age as 12, but that he's been missing since Feb 2006. Given that his date of birth is December 1995, this would make him only just 10 years old. (00:53:28)
Other mistake: When Evan is conducting the orchestra, his conducting pattern does not line up with the downbeat of one as the camera angle changes.
Answer: I think it was a necklace she was given by her father, and it breaking shows that she is breaking away from him. Her father picks it up, not Louis.
If her father picks it up, how is Wizard wearing it later in film?