Author Brad Rayberry is a take on real-life famous author Ray Bradbury.
In the episode, Jughead finds the unpublished manuscript of "The Jupiter Journals" by Brad Rayberry. This is, of course, a reference to "The Martian Chronicles" by Ray Bradbury. In the real world, the Chronicles were published in 1950, 5 years before the events of the episode. However, the last episode of the previous season sent everyone back in time, and it is not possible to know what changes occurred in the alternate time line.
Christopher Shyer makes his second appearance in a show called Riverdale. In 1997, he was in a Canadian soap called Riverdale that was meant to be like Coronation Street.