Why not ask the producer or the interviewer in advance? If I were them, I'd want to know if a guest was going to "wedge in a pitch". Rather than surprise them, get them to help you.
Just got my hair cut. The lady at Great Clips wished me well. So I've got that going for me.
And I had my people pull up some fun facts in case I need to reach into the quiver for something good.
Time to get some clothes together. The producer said business casual.... but my wardrobe goes from casual straight to suits....let's see what I can turn up...
Also, no white shirts or finely-patterned ties, since those can look bad on camera. Come to think of it, take a spare change of clothes just in case.