In Grand Theft Auto III, a Sentinel can be seen parked near the Staunton Island police station. In the movie Gone in 60 Seconds, the police use a BMW 5 series, but of a different generation. This means that the Sentinel is a reference to the car that the police use in the movie.
Grand Theft Auto: Liberty City Stories
In GTA Liberty City Stories, there is a mission called Don in 60 Seconds, given by JD O'Toole, which is another reference to the movie.