From Guy's forum:
"Hi doc! Have you noticed that the guitar solo of the song Good as Gold has a wrong note? At 1min46sec there's a slide note that makes me nervous everytime I hear it! It doesn't fit the harmony of the song. Very unusual, if not unique - when it comes to Knopfler's tunes. Was it Mark or Richard? And why leave it that way?"
Guy responds:
"Yes, of course I know. Isn't it great!"