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 Pánico en la granja (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.
Forest Whitaker voices a character that's a bear. In Ghost Dog, el camino del samurái (1999), his friend is reading a book about bears, and compares Whitaker's titular character to bears. In another scene, he sees two illegal hunters who have killed a black bear, and tells them "In ancient cultures, bears were considered equal with men" before shooting them down.