In the little bear's room that Celestine finds her way into towards the beginning of the movie, there is a poster for the director's previous film Uma Cidade Chamada Pânico (2009).
In the English version, the couple who owns the candy shop and the tooth shop, George and Lucienne, are played by real-life couple Nick Offerman and Megan Mullally.
In a few scenes where Celestine is drawing, she uses her left hand.