I also at no point got the impression that this fictional Feynman was very convincing, charming or anything like that. Just a bit of a talky wise-ass, really. Obviously he knows his stuff, but he's not direct enough to just say that outright, he tries to lord his intellect over the interviewer.
So I really wasn't sure what the punchline ("let's hire you in marketing") was all about. Is the interviewer saying this guy is a bad engineer since he doesn't get to the point? That he's a good marketer because he can talk lots and lots of bullshit?
Is the implication that being offered a position in marketing would be better than in engineering? It's definitely not what the candidate came in for, and the interviewer also doesn't mention if they would hire him for engineering, just for marketing.