Here’s an ad from Starlog magazine, circa 1977.
When I first saw this, I thought “Wow, this is totally illegal now.” But after doing some research I found that, yes, you totally can put a different “face” on the US dollar and it is perfectly legal (and has been since 1967). In fact, here are still people selling “celebrity” dollar bills on eBay. I’d love to have a Dr. Zaius bill, myself…