1. In April 2017 the decades.com website has an article titled http://www.decades.com/lists/11-nifty-little-visual-details-you-never-noticed-in-star-trek   it says some pipes on Kirk's  Enterprise were labeled "GNDN" as an inside joke to mean "Goes Nowhere, Does Nothing" which is actually a good description of Picard's crew, and this article says  Kirk and Spock visited Mayberry a couple times. As it was a Desilu production, Star Trek often shot outdoors on the studio's Forty Acres backlot, also home of The Andy Griffith Show. Thus, you can spot the familiar landmarks of Mayberry in "Miri," "The City on the Edge of Forever," "The Return of the Archons" and "A Piece of the Action" — but Mayberry can best be seen in the first two. "