Theme: The theme is that.. there is no theme(Kidding.)
I believe the theme is that the logo is only a face of a company, and the true intentions when they were made may have been different to what we think. We've never imagined our favorite Ronald to be that evil, right? Hopefully he really isn't, but the shock of it made me think that there are hidden sides to anything even if the visible side seems welcoming and positive.
Irony: I think the irony is that one criminal caused the destruction of the whole island the video takes place in. The video started off as a normal world with news of a clown, but in the end the island sinks, and the camera zooms out to outer space.
Symbols:
Logo: Basically the citizens in this video. Although they are what represent their company, their personalities are all of criminals or potty mouthed people. Some are also incorporated into the buildings.
(Dio)rama: The diorama represents the way the story is made. It is a work of art that's in 3D, and in this story all the characters were logos made in 3D. There isn't a single bit of 2D like in animation.
