Dave (along with two Mystery Science Theater 3000 alumni) does a cameo on the new episode of ADAM WALKS AROUND that covers MST3K film locations around Los Angeles (introducing a segment on "Agent For H.A.R.M."). It's at around the 40 minute mark.
If you're a fan of the show, you'll find a lot to enjoy!
https://youtu.be/sXhFJ_Oc0AU