Sylvester Stallone was ask to do the voice of Rambo but declined, so they used the audio from Rambo-movies. The sound seems as if it were recorded with a cassette player directly from the television.
In the first Rambo movie, Rambo kills only one policeman by accident, but in the game, the player is able to kill multiple, though points are deducted for this. The game instead encourages the player to merely disarm policemen.