Corrected entry: Caesar the Chimpanzee spoke human words. However Great Apes' vocal chords make them unsuitable for speech as they are higher in their throats. Since the virus only affects the brain and doesn't physically change the location of the apes' vocal chords, it's impossible for Caesar to speak, no matter how smart he is.
Corrected entry: When the apes break out of the Animal Control Center (with the glass dome), when the apes are looking at the city, a car passes. It's driving on the left, even though the movie is set in America.
Corrected entry: In the scene where it is revealed that Caesar is a very good chess player,the board is set up incorrectly.The white square is next to his left hand side instead of his right one.This is one of the first things that you learn when you are playing chess.The white square goes to the right.