Stevie was played by Butch Patrick, who the following year would land his signature role as Eddie on The Munsters (1964).
Uncle Martin paraphrases "one of your great philosophers" when he says, "Wondrous things occur when man and mountain meet." The actual quotation is "Great things are done when men and mountains meet / This is not done by jostling in the street." These words were written by William Blake circa 1793. The text is found in the "Rossetti MS."
Tim's car they take to go to Sunset Mountain is a 1963 Ford Falcon Futura.
The title is from the musical 'How to Succeed in Business Without Really Trying' with music and lyrics by Frank Loesser and book by Abe Burrows, Jack Weinstock, and Willie Gilbert, based on Shepherd Mead's 1952 book of the same name. The original Broadway production of "How to Succeed in Business Without Really Trying" opened at the Forty-sixth Street Theater in New York on October 14, 1961, ran for 1417 performances and won the 1962 Tony Awards for the Best Musical and Book and was nominated for Best Score.
Tim O'Hara wasn't the only one smitten by the beautiful Kathy Kersh, who played big sister Jennifer. Kersh went on to brief marriages to Vince Edwards (1965) and Burt Ward (1967-69).