At one point in the film, Matthew Broderick and Sanaa Lathan are talking about the impossibility of their relationship. Lathan's character says that they are like a hippo and a lion trying to mate. Broderick asks 'who's the hippo. Broderick voiced Simba in the "Lion King" franchise.
SPOILERS!
This is the second time that a film featuring Philip Baker Hall has animals falling from the sky. The first film was Magnolia (1999).