Big-Lipped Alligator Moment: About ten minutes in, for no real reason, Voley and Sean start line-dancing. And then an entire flock of sheep joins in. At the end of the scene they spin around to look at the sheep grazing as if even they're wondering whether that really just happened.
Older Than They Think: The 1948 Soviet cartoon "Little Gray Neck" has the same premise of an injured duckling left behind during the winter and threatened by a fox (it's an adaptation of an 1891 story).
Unintentionally Sympathetic: The fox comes across as this to some viewers by the end, when he walks home to his den while hanging his head in defeat. Since it was shown earlier that he has a family of cubs, his pursuing Sean can be interpreted as just needing to feed his cubs, rather than any personal vendetta he may or may not have.
Viewer Gender Confusion: Puffy: male or female? It's a small, androgynous baby bird with a unisex name and a voice that could either be taken as female or a woman voicing a young boy. Late in the film, Voley refers to Sean and Puffy as "boys," which can throw viewers who thought Puffy was female for a loop.
. At the end of the scene they spin around to look at the sheep grazing as if even they're wondering whether that really just happened.