The ????? song was the theme of Land of the Lost.
When Kahman's show used to run on a Live 365 channel, the show had to end around 1:45 or whatever so that if Live 365 inserted commercials, the end of the show wouldn't be cut off when the automated program scheduler switched to another show. I had to produce some padding for about 15 minutes worth so that the ending of the Kahnman two hour block would bleed into the next program or else the show would restart, play a few songs, then poof, it was gone. Not all the songs got played depending on when the show started, ended, or whether listeners heard the show without the Live 365 commercials or not (if they were paying subscribers).
Here are the songs that were played after the closing credits.
Good Girl - Lisa Whelchel
Taco And A Burger - Scott Craig And Kelly Parsons
The Naked Mole Rap - Ron Stoppable (Will Friedle) And Rufus (Nancy Cartwright)
Famous Jews - Seth Kurland
Pac-Man is Naked And So Should You - Worm Quartet