Did you try putting more structure (concentric outlines or a gradient or something) in the input image? Seems like style transfer would fall flat on a binary image.
Gradients in the source image tend to yield poor results. They often awkwardly reappear in the result, looking like an artifact doesn't fit with the style image at all.
Source images in a posterized style, with large flat surfaces in unified colors, tend to yield great results with few artifacts. With that in mind, I find the raw "21" logo to be a rather good source image. Two colors is minimalist, but it's a choice. I'm sure GP went for simplicity quite deliberately.
They just took the most obvious, silly things everyone predicts about the future and rendered them in the most simplistic, stylized ways.
Was unsuccessfully trying to articulate my gripe with this show but you hit the nail on the head. I think it also explains why I liked the first one best, while the talent show/advertising episode was just annoyingly silly.