Agnes Moorehead won an Emmy as Best Supporting Actress in a Drama Series for her performance as Emma Valentine.
Some modern sources erroneously list Mickey Daniels as the (uncredited) Laughing Henchman, as a result of a faulty identification by an inexperienced researcher. The role in question is played by WWW regular Whitey Hughes (has since been corrected).
The establishing shot of the Valentine home shows an elaborately towered and gabled, blue-ish place. That was a stock photo of the Carson Mansion in Eureka, Ca., generally deemed the ultimate Queen Anne style house. This Victorian edifice was built in 1886.
Emma has a computer like device, the love eternal machine, to determine suitable mates. By the 1830s, Charles Babbage had designed analog computing devices that met all the criteria to be what is now called Turing-Complete, as in a fully programable computer. Only the 19th century limitations of mechanical engineering prevented a Victorian computer industry.