Another small change when Thomas takes over (issue #126) involves the title's masthead:
As you can see, the title has now become "The World's Greatest Comix Magazine", seemingly in a nod to the underground comix movement (rather appropiate in a story involving the Mole Man). This change lasted for only a few issues (things are back to normal by issue #134, with the masthead once again saying "comic magazine").
I emailed Roy Thomas to ask him if he remembered who had made the change and why:
Don't recall. May have been my idea, but if so, was no better than Stan's short-lived "Pop Art Productions" of years before. we were comics, not comix.
Only a couple of years later Marvel would publish something closer to a "comix magazine": the fabled Comix Book, with work by several of the leading underground creators of the day.