Something I've noticed, while poring over old issues of Dragon, is how art from other TSR publications was re-used in their pages, particularly after about 1981 or so. It's a trend I noticed elsewhere in TSR's catalog, too, and I began to wonder what, if anything, it might tell us about what was going on inside the company at that time.
I'll leave such speculations to the future, because I have something more interesting to share, namely a piece of art by Erol Otus that appeared on the cover of an early issue of Polyhedron, the RPGA's newsletter. I was actually a member of the RPGA, though I never participated in any of its tournaments or other events. I joined primarily to get access to Polyhedron, which wasn't sold in stores and often contained some interesting gaming-related material, like the extensive interview with James Ward that appeared in issue #3.
Eventually, I noticed that Polyhedron had fewer and fewer original pieces of art, making do more often with hand-me-downs from other TSR publications. Again, I am sure we can speculate as to why this was so and what this says about TSR and the RPGA at that time. (It's a situation that eventually changed, as I understand it, though I had long since cancelled my membership by then). For me, though, what's most remarkable is that, even after 30+ years in this hobby, there are still tons of treasures from the early days unknown to me and, I suspect, a great many other gamers of similar vintage.