Flash 70 pg5 Big Head Flash and Caveman Green Lantern

This page takes me back to the silver age. It pairs up a couple of heros (Flash and Green Lantern) and has something crazy happen - like giving the Flash a BIG BRAIN genious and turning Green Lantern a cro-magnun.

Something I found interesting from a production perspective is that some of the inking on this page was gold rather than black. It doesn't show up in the scan but several scenery details are done this way. It makes me wonder if Roy had some help inking from someone else. If anyone has any other thoughts on why this happened, I'd love to hear from you.