FWIW, the copy of TV Guide I have for that week is the Colorado edition - got it (probably on e-bay) back in the '90s when I began aggressively filling in issues/years I was missing. There's no ad for Jeopardy in that edition either.
My experience with the game show ads is that they didn't start running them nationally until sometime in the late '70s - any ads you may have seen earlier would have just been in a few chosen editions.
For example, I've got a Central Pennsylvania edition from Nov 1, 1975. There's no ad for NBC's Gigantic Game Gala or the hour-long Price is Right in that edition, but editions from later in the '70s have ads for shows like Whew!