It was a brief cameo, maybe a minute or two long. Perhaps you can watch the episode on the ABC web site? Someone will upload it online probably. Joe played the director of a Def Leppard video for the song "Photograph," which came out in '83 actually so that's a slight anachronism as the show is set in 1984. Anyhow!

I was worried at first that I got the wrong night, because Joe's name didn't appear in the credits and he wasn't in the sneak previews or anything. But then bam, there he was going toe-to-toe with the handsome Jeremy Sisto.