Shortly before his death, Marlon Brando performed one final time as Don Corleone, a role he made iconic in The Godfather. The performance, which would go into the video game based on the film, would turn out to be his last as Brando would die a couple months later. As CaptainOT points out in his description, the audio is very poor in the snippets that could be salvaged for the game. Brando was on oxygen at the time and you can hear the machine as he talks and hear him slurring and short of breath.
Kind of a sad Easter Egg, but an easter egg nonetheless. Hear him in-game below.