Minerva Mineral Spa is actaully a cover where Minerva Secret extractor machine has clients reveal their deepest secrets-such as millionare William Dozier bonds in a grandfather clock and Tv Producer Howie Horritizer money in a TV set. Will Minerva extract the deepest secret of them all-the true identity of Batman and Robin?
At the end Alfred and Batgirl joke about the their mutal secret-the secret of Batgirl real identity as barbara Gordon which was introduced in Enter Batgirl, Exit Penguin as that epsiode was the first introduction of Batgirl intot he series-this episode was the last apperance of Batgirl in the series.
As the 1966 Movie Batman was supposed to be an introsuction of Batman and Robin, Batgirl doesnt appear in this movie
A cameo apperence is made by the series producers William Dozier and Howie Horrowitz.