I can't believe we have no Carbon Creek thread! We rewatched it last night, and I loved the little homages to Trek history - including references to City on the Edge of Forever in the clothing. Also, the Desilu connection and Mestral's love of I Love Lucy.
It's one of those episodes where it does leave you curious in the best way as to what happened to Mestral. It's a shame there was never a further exploration of that - such as a human being discovered with Vulcan genes. But I suppose the mystery is good too!