Well, and I am just guessing, but it looks like T Tops and Landau tops where all the rage and MPC just went with the fad and styles of the time. Notice that the Superfly also gets the butcher treatment on its roof like the Monkee Mobile did. And our subject vehicle also has the T Top option as well.
I think it was all that gaudy stuff that made me want it back then. It pop'd! Stock was just too boring for me, and still is, but those crazy parts and loopy decals where just the right ticket for a 13 year old! Thanks for the neat and colorful review!