I'll discuss Atticism in more detail later (likely in part 4 of my Thorough-going Eclecticism series) but I wanted to mention this now.
Just last night I was reviewing some areas that J.K. Elliott chalks up to atticism and was thinking, "so how do we know what an atticism is?" I mean, my one year of Greek at a formal learning institution was Attic (my autodidact efforts have focused largely on Koine/Hellenistic). I remember the biggies (e.g. Attic ττ shifts to Koine σσ, πραττω to πρασσω) but not much more.
Later in the evening I was reading Caragounis' The Development of Greek and the New Testament (amazon.com). Imagine my surprise when I ran across his section on Atticism, pp. 120-140 where he reproduces lists from Phrynichos (424 words!) and Moiris (less than 50 words) that could be helpful when reviewing variants for possible atticism.