Blatty wasn't involved in the original Pink Panther, but the movie was such a success that Sellers demanded that Blake Edwards be involved in his next film, A Shot In The Dark, and Edwards brought his comedy mentor Blatty along with him. Originally, this was not a Pink Panther movie, but Blatty decided that they should make the script into a sequel to The Pink Panther, and wrote it up as such.
And he's damn proud of his work. To this day, Blatty prefers to be remembered as the writer of The Pink Panther 2 than for what's arguably the best horror movie of all time.
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"*sigh* Another day, another hundred fanmails about my mother sucking cocks in Hell."