The grille is a big part of the characteristic look of any car and this was certainly so with the original Bullitt Mustang. By 1968 the stock grill was quite elaborate with the pony and corral, lights and chrome trim. So the de-badged movie car cleared all that away to leave a large black void ready to swallow its victims.
Here is a look at the different versions for comparison...
The 1968 Mustang GT had the usual array of chrome mustang, corral and lights and trim. This had varied year on year from the original 1964 launch. In a standard production car this was the way to go at the time adding styling features finished of the car and made it more desirable. That however was not the look that Frank Bullitt wanted.
In the de-badged Bullitt version that all went in favor of the anonymous stealth of a plain grill. Most of the chrome went missing and just a dark square mesh like an open mouth ready to swallow somebody up.
The 2001 version saw the introduction of the honeycomb grill that took on a different shape and not really in keeping with the original Bullitt style.
Once more in the 2008 Bullitt Mustang we get the authentic look of the wide mouthed beast but combined with the honeycomb mesh grille.
So in conclusion once again the 2008 Mustang Bullitt remake captures the real essence of the styling for the original 1968 Bullitt film version