A couple days ago, video finally got out featuring Jim Harbaugh making an appearance on an episode of Saved by the Bell: The New Class. It turns out Harbaugh did some other television. He made an appearance on The Adventures of Brisco County, Jr., which apparently was a show that ran in 1993 and 1994. I've never heard of it, but Coach Harbaugh made a brief cameo as a character named Mason "Cowboy" Dixon.
Thanks to Antony Jones who found some video and tweeted it to Matt Barrows. The video is above and features Harbaugh with then former and current NFL players Terry Bradshaw, Ken Norton Jr. and Carl Banks. I don't think this is quite as funny as the Saved by the Bell episode, but it's one more entertaining bit of television. Jim Harbaugh really is the gift that keeps on giving.
I did a search and it turns out Jim Harbaugh also made a cameo appearance on the old HBO show Arliss, appearing as himself in an episode from 1997 titled Truth and Responsibility. I couldn't find it on YouTube, so if you happen to come across it, let me know!