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Letraset's grasp of superhero lore was somewhat dodgy, as you've already seen from the 1966 pink Batman. Things weren't much better ten years later; you can have fun picking out the errors, but the most obvious is probably "Superman and Superwoman Foil Space Shot Raid".
In the upper part of this scan, featuring a rusty Aquaman, you can see how the transfer sheets were tucked into slits in the background card, & then stapled into place for extra security.
In the lower part of it, you can see the back of the staple — wow! — & the transfer sheet poking out on each side through the back of the card:
As you'll be able to read for yourself when you examine the scans, this range came with a promotional offer: if you rub down twelve of the Bat Signal logos which appear on each transfer sheet onto a piece of paper & send it to Letraset, they'll send you a Super Action Heroes set. Not sure if it's a random set, or if you can choose — but you'd better hurry up! These offers don't last forever, you know.
Number 5 is the odd one out; on the back of that one, the offer specifies a BATMAN Super Action Heroes set. My guess is that they reprinted the cards when they realised they would run out of Batman!
(Reprinting transfer sheets was expensive & difficult at this time; reprinting the backing cards, pretty straightforward.)
Pezing very kindly sent us from Germany some photos of (among other useful things) a sealed counter box of Super Friends:
We've arranged the twelve sets over twelve pages, so just click on one of these images to go to the right page for the title you're interested in.
Picture Credit: The SPLAT Scan Archives — Bob27Indy — Pezing
© Tom Vinelott 2021