The Mini Car + The Zeus?

It does seem it would be as much a dig at a Rolls-Royce or Bentley as it is about American cars. We would probably need someone involved in the production to be certain. Someone British from that time might know if it would have been a jab at Americans, and therefore funny to them, because the producers could not have expected many Americans to see the movie, so any dig would go unnoticed. I only found one theater showing it and the majority of seats remained empty. I don't remember it making the drive-in circuit later.

I believe a dig at sycophants was the primary message of the scene. Sir Guy presented an absurd product that no one would buy, while making it seem like his mind was already made up that it was the car of the future. He pretty much knew his corporate heads would agree.

At least that's how it came across in the book, but in the book we don't get to watch the cartoon car. Sir Guy was convinced everybody has a price, and the pretentious needed to be taken down a bit.