The ever-vigilant Lisa M pointed me toward this particular issue of PLOP from 1974. While it may not look historically significant, It contains two items that may well be marking their very first appearances in a code-approved comic book!
Item # 1 is the Aragones-drawn bird seen here "giving the bird!"
Item # 2 is the use, in the letter partially seen here, of the term "orgasmic!"
They may seem like little things to you but if you know anything about the Comics Code Authority, you know how unlikely these two items really were!!!