I thought the massage of this animation, was a warning to people who are easily influenced by just impressions of products or companies from lots of "logo" marks.
In the beginning of this film, the whole city is filled with logo marks and all the characters are also come from famous companies' image character, such as Lonald Mcdonald, or Big Boy, and those charaters act outside of our image which was inplanted by companies in order to make us buy more products.
Then, in the end, this whole weird world is destroyed because of black liquid which might be petroleum, and there seems to be no logos any more, but just before the endroll, when the universe was shown, there are still more logos that covers people. I thought this scene indicates that even though there are so much logos that confuses us to decide which to buy, those logos will never be gone. I believe the author wanted people to realise this fact and to think well when they buy products.
