Bill S, I was looking up some stuff & came across this link which says "Ralph’s ill-fated plan to open a no-cal pizzeria, a scheme cited in more than one episode but one that never made it to script." I also came across another site that said something along those same lines..however I can't remember what the address was so once I find it I will post it. Think there's anything to this? Maybe there never was a "no cal pizza" episode? The first link is at the bottom, once I find that other one I will post it.
http://www.sliceny.com/archives/2006/01/how_sweet_it_is.php

I personally don't believe there is a "No-Cal Pizza" episode, BUT, if there was one in existence somewhere, I doubt the people that wrote these articles would be aware of it. I guarantee you they had no idea about the original version of "Love Letter" until it was "discovered" back in 2004. The joke itself had to have originated from somewhere, and with No-Cal Pizza being a Ralph Kramden idea, I'd say that somewhere was a Honeymooners sketch. Every time it was mentioned on the show, it seemed to get a good laugh from the audience, so I could imagine the reaction it got the first time it was used.