The DreamWorks logo appears in black and white, and the boy on the moon is abducted by a tractor beam from a flying saucer hovering over. Afterwards, it burns up like an old film, segueing into the opening scene. The saucer is from the movie "Earth vs. the Flying Saucers."
During the closing credits, there is an additional scene in the War Room where the President prepares a latte for General Monger and pushes the wrong big red button. After hastily saying something about a contingency plan, he sticks his head seemingly out of the screen to address the audience: "Who wants to freeze my head?"