Diego: Are you calling me a liar?
Sid: I didn't say that.
Diego: You were thinking it.
Sid: [whispering to Manny.] I don't like this cat. He reads minds.
Even though it is snowing throughout much of the movie, none of the snow seems to stick to any of the characters' fur. Even during the fight scene when they are rolling around in it, they are never covered with white.