When we last left our heroes, in a cliffhanger ending at the end of BATMAN '66 MEETS THE GREEN HORNET # 1, Batman, Robin, The Green Hornet, and Kato were glued to the top of a fast-moving train headed straight toward a tunnel, and hero-squishville!
But, if issue # 1 represents "Wednesday", and its typical promise of certain death, issue # 2 brings "Thursday" and its requisite hair-breadth escape.
The Hornet and Kato find their own way off their "rail car of doom", as (separately) do the Caped Crusaders.
Via remote-control, Batman employs the Bat-Copter, which had been hovering nearby, to lift himself and the Boy Wonder out of their Bat-boots, which had been affixed to the train by their old enemy Colonel (now General) Gumm.
Up they go, just in time, leaving their boots behind!
Yep, here's a close-up shot of their Bat-Bare-Feet!
And another full-figure shot of them on the ladder, sans shoes.
But, WHAT'S THIS, as they ascend to the safety of the waiting Bat-Copter?
...And, before even such miracle workers as they, could possibly have changed into a spare pair!
Then, safely back on the ground, and reunited with The Green Hornet and Kato, the footwear has faded once again!
I thought about it for a time (Imagine the luxury of being able to ponder such things!) and I realized that, while it might very well have been an unforgivable error on the part of both the artist and the editor, it might be something else entirely...
It just might be a tremendous and purposeful HOMAGE to those wonderful days of 1960s television, where STOCK FOOTAGE was employed wherever possible to cut costs - and, on occasion, that stock footage didn't quite match the newly filmed scenes.
Yes, the reason Batman and Robin have boots, in a situation where they couldn't possibly have, is an ingenious nod to the sixties-era use of stock footage - in this case stock footage of the Dynamic Duo climbing the ladder to the Bat-Copter... Boots and all!
...Or, it just coulda been a mistake! You decide!