Board Thread:Editor Board/@comment-124.244.140.2-20131005120439/@comment-1173941-20140312174814

To my knowledge, there was no (noticable) difference between the web-novel and the light novel, in that scene. The only real difference would be the existence of 16.5, which was a story the author wrote long after the fact, and put in a seperate part of his site, alongside various other erotic fanfictions for SAO.

That being said, do you really want something as ridiculous as 16.5 to be part of canon?