I've always wondered how this came to be...
"Frankenstein and Dracula", on the cover and in the lead story of THE FLINTSTONES # 33 (Gold Key Comics, Cover Date: April, 1966), and not "Franken-stone and Dracu-slab"?
There's also The Wolfman and The Mummy thrown in for good monstrous measure!
If you have this comic, dig it out and re-read it (...or read it for the first time)! It wasn't a Halloween-timed release, but it should have been!
One more interesting Halloween thingee before we close (the coffin?)...
Here's the cover of WORLD'S FINEST # 152 (DC Comics, Cover Date: September, 1965). There are FIVE characters on the cover, in costume. Clark Kent, Bruce Wayne, and Dick Grayson are obvious, but WHO might the "other two" be?
But, the real interesting (sorta) "Halloween thingee" (I just LOVE writing that!) is found in the issue's letter column, where a mom writes in about making a Batman costume for her son!
First, this was 1965, and I doubt there were ANY "Batman costumes" available anywhere! The Dark Ages for cosplayers, perhaps? No Batman, Joker, Riddler, Harley Quinn, and Poison Ivy costumes to be photographed in... and, in fact, no Harley Quinn, and Poison Ivy - period!