Eu encontrei esta entrevista com o escritor e diretor, Rian Johnson , em que ele explica:
Could you explain " '78 Caddy? Controversial choice."?
Rian Johnson: That was one of the first cars I owned after college. And the "controversial choice" was something a friend of mine used to say, and you would never know whether it was a diss or compliment. You'd have your music on, and they'd nod and say "Hm. Steely Dan. Controversial choice." And you'd want to punch them but not know exactly why.
Parece que é apenas uma piada e não há nada realmente controverso sobre a multidão de carros que a Cadillac fez e vendeu em 1978.