Hallelujah! I've finally found a clip I've been looking for forever. Or more accurately, someone else found what I've been looking for. The folks at the Spider-Man fan site Spider-Man Crawl Space posted an old commercial from the 80s for Parker Brothers' Spider-Man video game for the Atari 2600. The graphics are laughable by today's standards, but it was one of my favorites as a kid. But that's not the reason I love this commercial.
It's because the production is pretty damned good, especially the costume of the Green Goblin. As the Spider-Man site suggests, this is what the movie Goblin should have looked like!