In describing the real time encounter between Zhang Sanfeng and the Xuanming Elder, Jin Yong made it seem like all that happened was Zhang Sanfeng placed a hand on the Xuanming Elder's shoulder, and victory was the Real Man's.
However, in chapter 27, it's said for the original incident, Zhang Sanfeng actually had a palm-to-palm clash with the Xuanming Elder, which was not described in the novel (in so far as I remember).
The exact quote is: 那玄冥神掌何等厉害,当年在武当山上,甚至和张三丰都对得一掌
The Xuanming Divine Palm is so powerful, it had been a match for one of Zhang Sanfeng's palms on Mt. Wudang years ago...
Which begs the question, what exactly happened in that encounter? Was there more than told in real time?