A couple issues with the rear lights on some cars. Not game-breaking by any means, but here they are:
First up, the 997/2:
On the real car, the tail and brake lights use different LED patterns. This trips up many videogame artists, who make both identical.
The real taillights are an open-ended shape
But they change to a closed shape when the brakes are applied, presumably to get that little extra bit of the following driver's attention
The in-game car uses the open-ended shape for both, so the tails are correct and the brakes are wrong, as pictured here
Now moving on to a newcomer, the Fabia WRC:
On the real car, the bottom portion of the lights functions as the tail light and the top portion is for the brakes. Again, having them be different grabs your attention more as a following driver.
On the in-game car, they just made everything red light up for both functions and called it a day.
Real car with tails on, no brakes. Top portion is dark.
Now real car with tails on and brakes applied. Top portion is now lit.
In-game car tails only. Everything is lit.
In-game car, brakes only. Everything is lit.