Hangover, The - Double Ford Taurus
When the guys first head on the road to Vegas Allen will stand up and scream "Whoa! road trip!". Just as he his about to stand up you will see a grey Ford Taurus to left on the car (right of the screen). It has NO front licence plate so keep a mental pic of that car, the car clearly passes them also the car on the other side has a licence plate thats what made me see this, now Allen sits back down and screams "Vegas!" and you can see the front of the cars and look whats back to the left of the car again, a grey Taurus with no licence plate!