This is my third or fourth time watching this movie, but I didn't really get bored because I find something new every time I watch it. I thought that the movie has two vital themes.
One theme is the america-based companies' empire. Nowadays we can see McDonalds or many American fast-food restaurants everywhere in the world, from Tokyo to a hamlet in China. (Like I ate dinner today at Wendy's; look at the previous post!) However, as they're fast and delicious, many great local foods are getting disappeared. The film makers criticize this fact using the character of McDonalds as a mad guy, and Michelin(savior of food) as police officer.
The other theme is the city cleanliness. The big cities, especially Tokyo have millions of advertisements in them. I admit that promoting companies have POWER and it actually is necessary to advertise products, but if we have no rules on beauty of Tokyo (like Kyoto made law about it), the city will be just like the city in Logorama.