Revealing mistake: The infant baby was computer animated in every scene in which the face appeared. Even the feet were obviously touched up by computer in the hallway scene. The lighting isn't quite right, the skin texture isn't quite right, and the child's face is just too animated.
Revealing mistake: The ping-pong ball that Theo and Julian pass between their mouths is lit inconsistently with the lighting in the car. It also moves independently of the confines of the actors' mouths. The ball was digitally added after filming this scene. (00:26:10)
Answer: Alfonso Cuaron compared the character of Theo to biblical characters like Moses, so I would assume that the animals' attraction to Theo is a reference to Noah and the Ark, which represents several themes in the film.
Brad ★