In the Sheila's wheels advertisement, if you look at the women singing in the car the road is pushing towards you.(forward)Then a few seconds later the road is moving the other way!!(Backwards)

This is a slip up because the car is pointing towards you, (indicating it is going the right way)

And when the road moves the opposite way it is still pointing towards you.

If the director of the advertisement did it on purpose the advert would look weird.