The interior shown on the show of the coach car was wrong for two big reasons: (1) The Superliner coaches have seats all facing forward, and no tables in the coaches, and (2) The passengers boarding and leaving the car do so at the center of the car (going up ad down the stairs) not at the end of the carthrough some imaginary vestibule. Plus of course, there's no red interiors.
The "Pacific Parlour Car" is indeed correct for a "double decker" train as it was originally built as the lounge car for the bi-level El Capitan - Although it's about six inches shorter (i.e. less tall) than a Superliner, and floor levels don't quite match up. Amtrak also has a few El Capitan bi-level coaches in service, and when the first run of Superliners came out Amtrak used El Capitan Step-Up coaches as dorm cars. What was incorrect, was when the one charactor asked where he could 'buy a beer", and the other told him about the Pacific Parlour Car, BUT Pacific Parlour car is not available to coach passengers, ONLY sleeping car passengers. Plus they don't sell long neck bottles, nor do they sell non-alcoholic beer.
But the worst scene on the show was when the four guys were initially arguing about which way to travel to San Francisco, the one guy's response to the suggestion of taking the train was , "it takes six hours longer and costs twice as much" (as flying). Not the kind publicity that Amtrak needs.
Where the writers totally missed the boat (oops wrong analogy) was: Here's four geek physicists, involved in the space program, and they completely ignored the fact that the Coast Startlight travels through Vandenburg AFB, which is the west coast missle launching site, they would have been in slide rule heaven.
But, I hope, mentioning the train and Amtrak is a good thing no matter what. Recall I did stipulate that this topic was to lighten things up.