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I talked with the producer of the show. I can confirm that the roadster is in the show, at least for some of the scenes. (Did you know that they actually filmed on SMU campus.)
I'm not sure I should be surprised that nobody noticed this, or even that I should admit to watching it, but, I did redface, and seeing as this is Dallas - The Next Generation, of course one of the new Ewing's is into Alternative Energy, thus he drives a Roadster. It was black, didn't catch the plate, but if it's anything like the Ferrari being driven, it changed at least once during the show
Anyway, as a future Model S owner, I was happy to see a Tesla in a mainstream(ish) show!