Other mistake: In the first dining room scene, Courtney is reading, but her book is invisible.
Barbie in the 12 Dancing Princesses (2006)
Directed by: Greg Richardson, Terry Klassen
Starring: Catherine O'Hara, Kelly Sheridan, Nicole Oliver, Jennifer Copping
Continuity mistake: In the first dining room scene, 7 of the princesses don't have collars in one shot.
Felix: The last time someone messed with my master, he was never seen or heard from again.
Derek: That's not true.
Felix: You're right, they did find a shoe.
Geniveve: If you say so, Fallon.
Fallon: You are head over heels.
Geniveve: Don't be ridiculous.
Answer: For poison, and she was in need of money.