Not a good way to end a season, and the series' final Freeze is the worst. Of course, Wallach and Preminger were poor replacements for the serious, sinister George Sanders performance. I guess its no surprise that every surviving season one villain suffered from inferior performances / scripts from season two forward. No one--not Romero, Meredith, Gorshin, Newmar, Wayne or Buono were able to rise to their early, "Mount Rushmore Plus" of villain adaptation performances beyond that first year.
The final season two arc was only memorable for its reference to Barbara Gordon (ohhh, but first run audiences had
no idea what they in for when September 1967 dropped like a car from a high rise), and the continued dumbing down of Robin. During the run of Dozier series, endless DC Comics fans were in full-on hate mode of the series, with the mishandling of characters like Robin being one of the oft-mention issues (when one compares him to his DC counterpart of the period). Ward still delivered the best adapted version of the character (live action or animated), but writers kicked him down to "Make Robin dumb to make Batman appear brilliant" mode not long into the 1st quarter of season two.
About Elisha Cook, Jr--yes, as you guys mention, he was in
Rosemary's Baby, a film with a small cameo from Wende Wagner aka
The Green Hornet's Lenore "Casey" Case.
I think most people missed the point of the final act's toy slot-car scene: it was about the entire Wayne Manor gang enjoying some family time together (probably the last time we would ever see them in such a scene) and then-upcoming publicity. Never one to miss a chance to sell the series, Greenway/Fox had this slot-car scene covered by
Model Car & Track, published in the July 1967 issue:
Although the Batmobile slot car (above) was not used in the episode, slot car racing was incredibly popular in this period, so it was only natural that versions of the Batmobile (and Black Beauty) were produced.