Surely you've noticed -- the way Astro is frequently illustrated to show a new-car-shine on his head, his butt and his belt . . . BUT . . . not his face, body or boots. Take a look at the illo of him in the upper left corner of this website (kind of looks like he's in the middle of a sneeze) -- the back of his noggin is reflecting light.
I don't recall this shiny-ness in the movie - or the lightly drawn "joint marks" on his arms or legs. These are the "roboty" things that remind you "he's not 'real'" -- just one of those delectable bits of minutia that would only end up on a site like this (and that's why I love this place so much!).
So whaddayathink?

- he uses too much greasy kid stuff (do they even MAKE Brylcreem anymore?)

- Noooo, No! This was
your doing, wasn't it? Call attention to the head and tush. Thanks, Dad!! Nice job!

- would you rather have patches, like me?