They almost always do that when they put pinball on tv/movies. It's because those are the sounds people normally associate with pinball. Also, the digital speech and sound effects are quite distracting to the dialog, compared to the simple bells/chimes. Could you imagine Carlin is doing a line and then JP goes "G-G-G-G-G-GO!"
I helped arrange an interview of a player who was going to IFPA by the local news. They tried to interview him while playing but later they had him "pretend play" and mixed in sounds at a much lower volume because they were just too distracting and loud.
Another thing, when they recorded closeups of gameplay we took the glass off CSI but then the mechanical sounds of the flippers and the ball hitting stuff overwhelmed the speaker sounds.
It looks like maybe only the GI lights are on in the Carlin vid. Or maybe they disconnected the DMD (it's off).
I have a friend that loans out several pins to a movie prop guy when films are done locally. All of the machines are stripped of the boards and the lights are rigged up to an external setup to randomly blink and stuff.