The first time I saw this I just about died. This piece of Alice ephemera has me written all over it. You see, my birthday is today, Halloween, and what better gift for me than an obscure piece of vintage Alice paper with a Halloween theme.
What this is, is a newspaper supplement from 1950 (nearly a full year before the film's release) called Pictorial Review, dated October 29th, 1950. Pictorial review is one of several newspaper supplements of the time that appeared in (usually) the Sunday paper. These kind of supplements still exist today, but I don't think this particular one does.
I'd love to find the original art on this...perhaps for my birthday next year.