Go to the scene where Tom Baker (Steve Martin) goes to the movies to spy on Eliot and Sarah. When he enters after buying a ticket, he spots Eliot and Sarah in one of the front rows and he encounters Jimmy Murtaugh (Eugene Levy) seated a few seats from the aisle where Tom is standing. When Tom demands why he's there, Jimmy answers, "If you must know, I'm here to make sure this movie's appropriate for our children", and Tom replies, "It's rated G." The movie within a movie in question is ICE AGE (also made by 20th Century Fox). But in reality, ICE AGE is rated PG (not G) for Mild Peril.