I know I'm nearly four years late on this one (new member), but I believe Opie and Johnny Paul were actually doing "Odds or Evens" - not "Rock, Paper, Scissors" - to make the sales pitch.
Ever notice how Floyd usually does some funny gesture after someone departs from his company? Like after Barney gives him a cigar and leaves (If I had a Quarter of a Million) Floyd fumbles around with the cigar. He does this in other instances as well. In "Barney's Bloodhound" he places the candy in his pocket, then out, then almost back in, then finally eats it!
I don't know whether you've ever noticed, Michael, but Floyd is a little bit "different." Speaking ONLY of his mannerisms, of course (tee hee). What a brilliant actor! I've often wondered if those bits were scripted for him or if he just came up with them on his own?
I have heard that Floyd was a bit like his character on the show in real life. Very quirky, and I like quirky.
Truth is that they were all incredible actors. And the attention to very subtle details, coupled with the flawless music accompaniment made this show such a gem.
I have always wondered why Earle Hagen didn't produce an album of the music used on the show. To this day it still makes each show just that much more memorable !