Chevy Chase remarks making it into the script

I have heard from a couple places that some things Chevy had said to Dan Harmon ended up making it in to episodes as lines of dialog from Pierce ("Im 66, dick," is the biggest example I remember). This just seems to be commonly accepted as trivia for the show. I have tried looking into it to find some kind of interview, panel at a con, anything, that's a direct source of that being confirmed. I wanted to find other examples of this happening in the show, but I can't seem to find a quote from Dan. Everything ive found in searching is just like forum commenters saying "yeah I'm pretty sure that's a thing I heard somewhere." I'm bad at research, if anyone could find confirmation of this claim I'd be very grateful. Bonus points if there's confirmation of any OTHER of Chevy’s comments making it into the script