In the scene where Veronica (Kristen Bell) infiltrates the video game place she joins is the first person shooter (FPS) game Unreal Championship for the Xbox, wherein one sees from one's character's point of view. It is impossible then for three people (her and the 2 other guys) to play a multiplayer FPS match on a single screen without the screen being divided (split screen).
When Veronica is sitting on the bench with Karl, after she comments on her hair being blonde, a shot from behind Veronica shows her talking. However, her lip movements do not match the sound heard.